The method of measuring basal temperature is very popular among women. It is used both as one of the methods of contraception, and, on the contrary, in order not to miss ovulation. During pregnancy, basal temperature can become one of the early signals of pathology.
What is basal body temperature?
Basal refers to the temperature in the rectum. It may be slightly higher than the temperature in the armpit by a few tenths of a degree or coincide with it. In men, this indicator is more or less stable, in women it fluctuates depending on the phase of the menstrual cycle or pregnancy.
It should be remembered that basal temperature indicators have a wide range of individual differences, so this method becomes most informative when measured daily.
A single increase or decrease in temperature has no diagnostic value. That is why many ladies keep a basal temperature chart for several months or years.
How to measure it?
For measurements, a special rectal thermometer is used, which can be electronic or mercury. The readings of a mercury thermometer are considered more accurate, but an electronic one is safer to use.
You can also use a regular thermometer, but this is less convenient. The device is inserted into the anus by 2-3 cm, the temperature measurement time is 5-7 minutes. During the procedure, you need to lie on your side, it is advisable to avoid unnecessary movements.
The temperature is measured in the morning (best before 8 o'clock), with the same thermometer at the same time. This is very important to keep the results informative.
These rules are the same for women of any age in all phases of the cycle and during pregnancy at any time. It is not necessary to observe the measurement time to the nearest minute, deviations of half an hour will not significantly affect the result.
The period of observation of basal temperature is 4 menstrual cycles or more. Only in this case, it is possible to draw any conclusions from the information received, calculate the individual range of fluctuations during the cycle, and judge the possible pathology, if any.
In order for the data to be reliable, you need to go to bed, put a thermometer next to you, set an alarm, and measure the temperature immediately upon waking up. Then you need to write down the result (you can immediately put a notebook and a pen next to the thermometer), after which you can go to bed again.
Any disease accompanied by an increase in body temperature (including a mild cold), alcohol, and having sex the day before can distort the results.
During pregnancy, the most valuable information is provided by indicators in the early stages (1-2 weeks), then their significance decreases.
Chart of basal temperature during pregnancy before delay
Despite the fact that the values of BT are individual, there are general trends by which it is possible to track the processes occurring in the female reproductive system. The lowest temperature is observed in the last days of menstruation and immediately after it.
Then, during the entire first phase of the cycle, there is a gradual increase in BBT, the maximum falls on the 2-3rd day after ovulation. Immediately before the release of an egg ready for fertilization, the temperature may drop (not observed in all women). Then there is a slow decline.
If conception occurs after ovulation, then the graph curve will go down sharply when it should be at its peak, low values \u200b\u200bwill be kept for several days, then a systematic increase in basal temperature will begin. This is one of the early signs of pregnancy, allowing you to determine it before the delay.
Additional signs will help to more accurately determine the onset of pregnancy - bloody discharge from the vagina a little earlier than the expected menstruation (implantation bleeding), a slight deterioration in well-being. All of these signs occur before the delay, but may not be pronounced.
Graph of basal temperature during pregnancy
As already mentioned, the most informative graph of basal temperature in the first 2 weeks (before the delay). But sometimes there is a need to measure this indicator within 12 weeks or before delivery.
Measurement of BBT is a simple, affordable and minimally invasive way to monitor the condition of the fetus. It is not accurate enough, but it allows you to observe the development of the future baby in dynamics and determine pathologies in time.
The rules for measuring in the early stages remain the same as before pregnancy. It is necessary to record the indicators in the morning, at the same time, immediately after waking up, but without getting out of bed (to do this, put a thermometer, a notebook and a pen next to the bed), be sure to build a graph for clarity and take measurements every day.
Starting from the third week (when the delay becomes apparent), the temperature remains consistently high. Despite the fact that the norm in this case is relative, if the thermometer showed less than 37 °, then you should consult a gynecologist.
In the future, a consistently high level of basal temperature remains, normally it ranges from 37 ° to 38 °, if the value is above or below the specified corridor, this can be an alarming sign.
A slight decrease is possible at week 11, but not necessary. Here, the lower limit of the norm is 36.9 °.
On the twelfth week, the indicators return to the value of the previous periods. At later dates, BBT measurements are usually not carried out, although the gynecologist may recommend continuing the procedures if there is a risk of premature termination of pregnancy.
If a woman continues to measure until childbirth, she may notice that BBT begins to rise 1-2 days before the birth of the baby. But in this case, there are more obvious signs and harbingers that appear earlier and are more informative.
Increased or decreased basal temperature - what does it mean?
Despite the fact that the normal indicators of BT are individual, there is a corridor of values in which fluctuations do not pose a threat to the health of the mother and baby.
As already mentioned, this is 37-38 °. In some periods of pregnancy, the temperature rises, in others it drops, but if it remains within the specified limits, there is nothing to worry about.
If BT has dropped below 37 °, this indicates possible pathologies of pregnancy - progesterone deficiency, missed pregnancy, or the threat of miscarriage.
The diagnosis on one basis is not accurate, but if a woman notices such a feature, she should tell the gynecologist about it. Of particular danger is a sharp drop in BBT below the normal value.
High internal temperature (above 38 °) is an indicator of the inflammatory process. In this case, it is accompanied by an increase in general body temperature, general malaise, and other symptoms of the disease.
But there is another reason for the increased performance - incorrect measurement or physical activity before the procedure, diet errors, sex. Therefore, if the BT is kept high, but the woman feels good, there is nothing to worry about.
In general, it is important to remember that a single change in the indicator, even if it goes beyond the norm, is not dangerous, a sign of pathology is a persistent decrease or increase in BBT for 4-5 measurements in a row.
Examples of basal temperature charts during pregnancy
This is how the basal temperature graph looks like before the delay is normal:
On this graph, you can clearly see all three phases of changes in BBT. Phase 1 - the normal first half of the cycle before ovulation, the second corresponds to ovulation and conception, the third - implantation retraction and a subsequent increase in temperature, by which pregnancy can be determined before the delay.
On the graph, the letter M marks the days of menstruation, O - ovulation, B - the time when pregnancy is determined.
A few more examples of basal temperature charts can be seen below.
Some more additional tips for determining basal temperature - in the next video.
Anovulatory schedule let's say 1-2 times a year even in perfectly healthy women. In other cases, it is a hormonal disorder. You should immediately visit a doctor to start timely treatment.
With endometritis
By analyzing the basal temperature, it is possible to identify the presence of a disease such as endometritis. Normal at the beginning of a new cycle temperature should drop. If during menstrual flow an increase in BT occurs and remains at this level, then this is a clear symptom of the presence of the disease.
Along with this, the appearance of other symptoms of the disease is noted. These include the following:
- Pain during intercourse.
- Feeling worse.
- Cycle breaking.
- Purulent discharge.
- Uterine bleeding.
It is not recommended to determine deviations according to the BT schedule on your own. This should be done attending doctor. Treatment is prescribed based on the results of tests and other studies.
The graph of basal temperature during pregnancy reflects the direct dependence of rectal indicators on the influence of hormones at different periods of the menstrual cycle.
MC has 2 phases.
- Follicular - the first half proceeds under the influence of estrogen. During the period of maturation of the egg, temperature fluctuations are allowed within the range of 36.4–36.8 ° C.
- Luteal - ovulation occurs. That is, the bursting follicle is replaced by the corpus luteum, which synthesizes progesterone. An increase in hormone production provokes an increase in temperature by 0.4–0.8 ° C.
In a normal state (before pregnancy), the basal temperature drops slightly before menstruation. A jump in indicators to a minimum downward is noted before ovulation.
An example of a normal two-phase temperature graph:
normal example
The middle (or overlapping) line serves to make the curve easier to read. It is carried out at the points of six temperature values before ovulation in the follicular phase.
The first 5 days of menstruation, as well as situations in which external factors influenced, are not taken into account. Consider a photo that shows what a finished chart looks like with real temperature readings during pregnancy:
The woman celebrated every day
The curve shows that BBT does not decrease before menstruation. If, against the background of increased rectal temperature, there is a delay in menstruation, then the pregnancy has taken place.
To confirm the findings, it is necessary to conduct a test and come for a consultation with a gynecologist. Be sure to show your temperature chart to your doctor.
Signs of pregnancy and its absence on the BBT chart
At conception, the basal temperature rises. The indicators do not decrease before the onset of menstruation and remain throughout the entire gestation period.
You can determine pregnancy according to the schedule by the temperature jump on the 7-10th day after ovulation - this is the moment the fertilized egg is introduced into the inner lining of the uterus.
Sometimes early or late implantation is observed. Even the most informative ultrasound examination cannot reliably track this process.
A sharp decrease in temperature on the graph in the second phase is called implantation depression. This is one of the first and most frequent signs that is noted on the basal chart with a confirmed pregnancy.
This phenomenon is due to two reasons.
- The increased production of progesterone increases the temperature, which gradually decreases closer to the middle of the luteal phase. At conception, the corpus luteum begins to actively synthesize the hormone, which leads to fluctuations in values.
- If pregnancy occurs, then a large amount of estrogen is released, which causes a sharp decrease in temperature in the scheme.
The connection of hormones with different functions leads to a shift, which manifests itself in the form of an implantation depression on a personal map.
This phenomenon cannot be reflected by any other study other than the basal temperature curve. Example:
Implant retraction
Please note that with a completed pregnancy, starting from the 26th day of the menstrual cycle, the schedule becomes three-phase. This is due to the increased synthesis of progesterone after implantation of the egg.
Confirmation of the introduction of the embryo may be a slight discharge that disappears in 1-2 days. This is implantation bleeding, which is caused by damage to the endometrium.
Nausea, breast swelling, intestinal disorders and other similar signs are not reliable. There are cases when, even with severe manifestations of toxicosis, pregnancy did not occur.
And, on the contrary, without a single sign, the woman stated the fact of a successful conception. Therefore, the most reliable conclusions are considered to be a persistent increase in basal temperature, implantation retraction. Another sign is a delay in menstruation, subject to sexual contact during the period of ovulation.
A decrease in temperature before menstruation is a sign of the absence of pregnancy. Fluctuations in rectal numbers can be interpreted in different ways. Fever is not always a sign of pregnancy. This is possible due to inflammation of the appendages.
Each case must be compared with all the changes in the body and confirm your observations in the gynecologist's office.
It is important to record data regularly
Normal basal temperature chart during pregnancy
Keeping a BT calendar is relevant only at the very beginning, that is, in the early stages of gestation. Favorable conditions are necessary for the normal development of the embryo in the first trimester.
For this, the body of a pregnant woman begins to intensively produce progesterone. This hormone raises the temperature in the reproductive system to create a "warm" environment for the embryo.
Normally, after the onset of egg implantation, the basal temperature figures on the diagram should be in the range of 37.0–37.4 ° C.
However, in some cases, a drop to 36.9 ° or an increase to 38 ° is allowed. Such values may be considered acceptable.
Unusual BT schedules during pregnancy
Normally, the temperature difference between the first and second phases should fluctuate within the allowable 0.4 ° C and above.
How to determine the average BBT? To do this, it is necessary to add up all the temperature numbers obtained during the measurement, first in period I, dividing the sum by the number of days. Then similar calculations are carried out with indicators of phase II.
Let's look at a few examples that are most common.
Anovulatory cycle
This graph shows a uniform curve without division into periods. It can be seen that BT in the luteal phase remains low, not exceeding 37°C.
In the absence of ovulation, the formation of the corpus luteum is impossible, which activates the synthesis of progesterone. There is no upswing.
If the anovulatory cycle is repeated periodically, no more than 1-2 times a year, then this is the norm. However, if the situation occurs in a row for 60 days or several months, then it will be difficult to get pregnant on your own.
Next example:
Need to consult a doctor
With estrogen-progesterone deficiency, the rectal temperature chart remains low after ovulation, up to the 23rd day of the cycle. The difference between the average values is a maximum of 0.2–0.3°.
A similar curve built over several MCs indicates a lack of production of hormones important for the development of pregnancy. The consequence of the pathology may be endocrine infertility or the threat of miscarriage in the early stages.
Next example:
Possibly a disease
Endometritis is an inflammation of the inner lining of the body of the uterus. With this disease, the temperature curve reflects a decrease in indicators before menstruation and a sharp rise in values, uncharacteristic for the first phase.
Next example:
The chart is useless here.
This graph shows high readings up to 37° in the first phase. Then there is a sharp decline, which is often mistaken for an ovulatory rise. With inflammation of the appendages, it is difficult to correctly determine the moment of release of the egg.
By examples, it can be understood that it is easy to identify pathologies using a personal basal map. Of course, twins or one embryo can only be shown by ultrasound, but the conception on the BT map is determined accurately.
Graph of basal temperature for ectopic and missed pregnancy
With anembryony (death of the fetus), elevated rectal values decrease to 36.4–36.9°C. The decrease in temperature on the graph is due to the regression of the corpus luteum and the stoppage of progesterone production.
Low values in the second phase are possible due to a lack of hormones. Sometimes, with a frozen pregnancy, there is a sharp rise in temperature against the background of decomposition of the embryo and inflammation of the endometrium.
Ectopic conception by rectal indicators can not be detected. With ectopic fetal development, progesterone is produced as during normal gestation of the first trimester.
However, against the background of the growth of the embryo, there are symptoms that you should immediately pay attention to. This is an acute pain syndrome in the abdomen, discharge, vomiting, etc.
On the days of ovulation
At the same time, an inflammatory process can develop, which is usually manifested by a sharp rise in temperature to 38 ° and above.
Do not self-diagnose. Any suspicious changes in the rectal temperature chart should be reported to a doctor.
Measurement of basal temperature has become a truly popular means of pregnancy planning.
Why measure basal body temperature
Basal or rectal temperature (BT)- this is the body temperature at rest after at least 3-6 hours of sleep, the temperature is measured in the mouth, rectum or vagina. The temperature measured at this moment is practically not affected by environmental factors. Experience shows that many women perceive the doctor's requirements to measure basal temperature as a formality and basal temperature does not solve anything, but this is far from the case.
The method of measuring basal body temperature was developed in 1953 by the English professor Marshal and refers to research methods based on the biological effect of sex hormones, namely on the hyperthermic (temperature increase) action of progesterone on the thermoregulation center. The measurement of basal body temperature is one of the main tests for the functional diagnosis of ovarian function. Based on the results of measuring BT, a graph is built, an analysis of the graphs of basal temperature is given below.
Measurement of basal temperature and scheduling is recommended in gynecology in the following cases:
If you have been trying to get pregnant for a year without success
If you suspect infertility in yourself or your partner
If your gynecologist suspects you have hormonal disorders
In addition to the above cases, when basal body temperature charting is recommended by a gynecologist, you can measure basal body temperature if:
You want to increase your chances of pregnancy
You are experimenting with the method of planning the sex of the child
You want to observe your body and understand the processes taking place in it (this can help you in communicating with specialists)
Experience shows that many women perceive the doctor's requirements to measure basal temperature as a formality and it does not solve anything.
In fact, by measuring your basal body temperature, you and your doctor can find out:
Does the egg mature and when does it happen (respectively, highlight "dangerous" days for the purpose of protection, or vice versa, the possibility of getting pregnant);
Did ovulation occur after the maturation of the egg?
Determine the quality of your endocrine system
Suspect gynecological problems, such as endometritis
When to expect your next period
Whether pregnancy occurred in case of delayed or unusual menstruation;
Assess how correctly the ovaries secrete hormones in the phases of the menstrual cycle;
A graph of basal temperature, compiled according to all the rules of measurement, can show not only the presence of ovulation in the cycle or its absence, but also indicate diseases of the reproductive and endocrine systems. You must measure your basal temperature for at least 3 cycles so that the information accumulated during this time allows you to make accurate predictions about the expected date of ovulation and the most favorable time for conception, as well as conclusions about hormonal disorders. Only a specialist gynecologist can give an accurate assessment of your basal temperature chart. Charting a basal temperature chart can help a gynecologist determine deviations in the cycle and suggest the absence of ovulation, but at the same time, a diagnosis by a gynecologist only and exclusively based on the type of basal temperature chart without additional tests and examinations most often indicates medical unprofessionalism.
It is necessary to measure the basal temperature, and not the body temperature in the armpit. The general increase in temperature as a result of illness, overheating, physical exertion, eating, stress, naturally affects the basal temperature and makes them unreliable.
Thermometer for measuring basal temperature.
You will need a conventional medical thermometer: mercury or electronic. With a mercury thermometer, the basal temperature is measured for five minutes, while the electronic thermometer must be removed after the signal about the end of the measurement. After he squeaked, the temperature will still rise for a while, because the thermometer fixes the moment when the temperature rises above it very slowly (and do not listen to nonsense about the fact that the thermometer is in bad contact with the muscles of the anus). The thermometer must be prepared in advance, in the evening, by placing it next to the bed. Don't put mercury thermometers under your pillow!
Rules for measuring basal temperature.
It is necessary to measure the basal temperature, if possible, every day, including on the days of menstruation.
You can measure in the mouth, in the vagina or in the rectum. The main thing is that throughout the entire cycle the place of measurement does not change. Armpit temperature measurement is not accurate. With the oral method of measuring basal temperature, you put a thermometer under your tongue and, with your mouth closed, measure for 5 minutes.
For vaginal or rectal measurements, insert the narrow part of the thermometer into the anus or vagina, measuring for 3 minutes. Measurement of temperature in the rectum is the most common.
Take your basal body temperature in the morning, right after waking up and before getting out of bed.
It is necessary to measure the basal temperature at the same time (a difference of half an hour - an hour (maximum one and a half hours) is acceptable). If you decide to sleep in longer on the weekend, make a note of this on your schedule. Keep in mind that every extra hour of sleep raises your basal temperature by about 0.1 degrees.
Uninterrupted sleep before measuring basal temperature in the morning should last at least three hours. Therefore, if you measure the temperature at 8 am, but got up at 7 am to go, for example, to the toilet, it is better to measure BT before that, otherwise, at 8 o'clock familiar to you, it will no longer be informative.
You can use both digital and mercury thermometers to measure. It is important not to change the thermometer during one cycle.
If you use a mercury thermometer, shake it off before you go to sleep. The effort you make to shake off the thermometer just before taking your basal temperature can affect your temperature.
Basal body temperature is measured in the supine position. Do not make unnecessary movements, do not turn around, activity should be minimal. Never get up to take a thermometer! Therefore, it is better to cook it in the evening and put it near the bed in order to be able to reach the thermometer with your hand. Some experts advise taking measurements without even opening your eyes, as daylight can increase the release of certain hormones.
Readings from the thermometer are taken immediately after it is removed.
Basal temperature after measurement is best recorded immediately. Otherwise, you will forget or get confused. Basal temperature every day is approximately the same, differs by tenths of degrees. Relying on your memory, you can get confused in the testimony. If the thermometer readings are between two numbers, record the lower reading.
The graph must indicate the reasons that could lead to an increase in basal temperature (ARI, inflammatory diseases, etc.).
Business trips, moving and flights, sexual intercourse the night before or in the morning can significantly affect the basal temperature.
In diseases accompanied by elevated body temperature, your basal temperature will be uninformative and you can stop measuring for the duration of the illness.
Various medications, such as sleeping pills, sedatives, and hormonal medications, can affect basal body temperature.
Measurement of basal temperature and the simultaneous use of oral (hormonal) contraceptives does not make any sense. The basal temperature depends on the concentration of hormones in the tablets.
After taking a large amount of alcohol, the basal temperature will be uninformative.
When working at night, basal temperature is measured during the day after at least 3-4 hours of sleep.
The basal body temperature (BT) record table should contain the lines:
Day of the month
cycle day
BT
Notes: Abundant or moderate discharge, abnormalities that can affect BBT: general illness, including fever, diarrhea, intercourse in the evening (especially in the morning), drinking alcohol the day before, measuring BBT at an unusual time, going to bed late (for example, went to bed at 3 o'clock, and measured at 6), taking sleeping pills, stress, etc.
The "Notes" column contains all the factors that in one way or another could affect the change in basal temperature.
This form of recording helps both the woman and her doctor to understand the possible causes of infertility, cycle disorders, etc.
Rationale for the basal body temperature method
Basal body temperature during the cycle changes under the influence of hormones.
During the maturation of the egg against the background of a high level of estrogens (the first phase of the menstrual cycle, hypothermic, "low"), the basal temperature is low, on the eve of ovulation it drops to its minimum, and then rises again, reaching a maximum. At this time, ovulation takes place. After ovulation, the high temperature phase begins (the second phase of the menstrual cycle, hyperthermic, "high"), which is caused by low levels of estrogen and high levels of progesterone. Pregnancy under the influence of progesterone also takes place completely in the high temperature phase. The difference between the "low" (hypothermic) and "high" (hyperthermal) phases is 0.4-0.8 °C. Only with accurate measurement of basal body temperature, it is possible to fix the level of "low" temperature in the first half of the menstrual cycle, the transition from "low" to "high" on the day of ovulation, and the temperature level in the second phase of the cycle.
Usually during menstruation, the temperature is kept at 37 ° C. During the maturation of the follicle (the first phase of the cycle), the temperature does not exceed 37°C. Before ovulation itself, it decreases (the result of the action of estrogen), and after it, the basal temperature rises to 37.1 ° C and above (the effect of progesterone). Until the next menstruation, the basal temperature remains elevated and slightly decreases by the first day of menstruation. If the basal temperature in the first phase, relative to the second, is high, then this may indicate a small amount of estrogen in the body and requires correction with drugs containing female sex hormones. On the contrary, if in the second phase, relative to the first, a low basal temperature is observed, then this is an indicator of a low level of progesterone, and drugs are also prescribed here to correct the hormonal background. This should be done only after passing the appropriate tests for hormones and prescribing a doctor.
A persistent two-phase cycle indicates ovulation, which has taken place and the presence of a functionally active corpus luteum (the correct rhythm of the ovaries).
The absence of a rise in temperature in the second phase of the cycle (monotonous curve) or significant temperature fluctuations, both in the first and second half of the cycle with the absence of a stable rise, indicates inoculation (lack of release of the egg from the ovaries).
The delay in the rise and its short duration (hypothermic phase for 2-7, up to 10 days) is observed with a shortening of the luteal phase, insufficient rise (0.2-0.3 ° C) - with insufficient functioning of the corpus luteum.
The thermogenic effect of progesterone leads to an increase in body temperature by at least 0.33 ° C (the effect lasts until the end of the luteal, that is, the second, phase of the menstrual cycle). Progesterone levels peak 8 to 9 days after ovulation, which is approximately the time a fertilized egg implants in the uterine wall.
By making a chart of basal temperature, you can not only determine when you ovulate, but also find out what processes are taking place in your body.
Decoding charts of basal temperature. Examples
If the basal temperature chart is built correctly, taking into account the measurement rules, it can reveal not only the presence or absence of ovulation, but also some diseases.
Break line
The line is drawn over 6 temperature values in the first phase of the cycle, preceding ovulation.
This does not take into account the first 5 days of the cycle, as well as days on which various negative factors could affect the temperature (see temperature measurement rules). This line does not allow any conclusions to be drawn from the graph and is for illustration purposes only.
ovulation line
In order to judge the onset of ovulation, the rules established by the World Health Organization (WHO) are used:
Three temperature values in a row must be above the level of the line drawn over the previous 6 temperature values.
The difference between the midline and the three temperatures must be at least 0.1 degrees on two of the three days and at least 0.2 degrees on one of those days.
If your temperature curve meets these requirements, then an ovulation line will appear on your basal temperature chart 1-2 days after ovulation.
Sometimes it is not possible to determine ovulation according to the WHO method due to the fact that there are high temperatures in the first phase of the cycle. In this case, you can apply the “finger rule” to the basal temperature chart. This rule excludes temperature values that differ from the previous or next temperature by more than 0.2 degrees. Such temperatures should not be taken into account when calculating ovulation, if in general the basal temperature chart is normal.
The most optimal time for conception is the day of ovulation and 2 days before it.
Menstrual cycle length
The total cycle length should normally not be shorter than 21 days and should not exceed 35 days. If your cycles are shorter or longer, then you may have ovarian dysfunction, which is often the cause of infertility and needs to be treated by a gynecologist.
Second phase length
The basal temperature graph is divided into the first and second phases. The separation takes place where the ovulation line (vertical) is affixed. Accordingly, the first phase of the cycle is the segment of the graph before ovulation, and the second phase of the cycle after ovulation.
The length of the second phase of the cycle is normally from 12 to 16 days, most often 14 days. In contrast, the length of the first phase can vary greatly, and these variations are an individual norm. At the same time, in a healthy woman in different cycles, there should not be significant differences in the length of the first phase and the second phase. The total length of the cycle normally changes only due to the length of the first phase.
One of the problems revealed on the graphs and confirmed by subsequent hormonal studies is the insufficiency of the second phase. If you have been measuring your basal temperature for several cycles, following all the measurement rules, and your second phase is shorter than 10 days, this is a reason to consult a gynecologist. Also, if you regularly have sexual intercourse during ovulation, pregnancy does not occur and the length of the second phase is at the lower limit (10 or 11 days), then this may indicate a lack of the second phase.
temperature difference
Normally, the difference in the average temperatures of the first and second phases should be more than 0.4 degrees. If it is lower, then this may indicate hormonal problems. Take a blood test for progesterone and estrogen and consult a gynecologist.
An increase in basal temperature occurs when the level of progesterone in the blood serum exceeds 2.5-4.0 ng / ml (7.6-12.7 nmol / l). However, monophasic basal temperature has been identified in a number of patients with normal progesterone levels in the second phase of the cycle. In addition, monophasic basal temperature is noted at approximately 20% of ovulatory cycles. A simple statement of a two-phase basal temperature does not prove the normal function of the corpus luteum either. Basal temperature also cannot be used to determine the time of ovulation, since a two-phase basal temperature is also observed during luteinization of a non-ovulated follicle. Nevertheless, the duration of the luteal phase in accordance with the data of basal temperature and the low rate of rise in basal temperature after ovulation are accepted by many authors as criteria for diagnosing the syndrome of luteinization of a non-ovulating follicle.
Five main types of temperature curves are described in classic gynecological manuals.
On such graphs, there is an increase in temperature in the second phase of the cycle by at least 0.4 C; noticeable "preovulatory" and "premenstrual" temperature drop. The duration of the temperature increase after ovulation is 12-14 days. Such a curve is typical of a normal biphasic menstrual cycle.
The graph example shows a pre-ovulatory drop on the 12th day of the cycle (the temperature drops significantly two days before ovulation), as well as a premenstrual drop starting from the 26th day of the cycle.
There is a weakly pronounced rise in temperature in the second phase. The temperature difference in the first and second phases is no more than 0.2-0.3 C. Such a curve may indicate estrogen-progesterone deficiency. See chart examples below.
If such schedules are repeated from cycle to cycle, then this may indicate hormonal disruptions that cause infertility.
Basal temperature begins to rise only shortly before menstruation, while there is no "premenstrual" temperature drop. The second phase of the cycle may last less than 10 days. Such a curve is typical for a two-phase menstrual cycle with insufficiency of the second phase. See chart examples below.
Pregnancy in such a cycle is possible, but it is at risk from the very beginning. At this point, a woman still cannot know about the onset of pregnancy, even gynecologists would find it difficult to make a diagnosis at such an early date. With such a schedule, we can talk not about infertility, but about miscarriage. Be sure to contact your gynecologist if you have such a schedule for 3 cycles.
In a cycle without ovulation, the corpus luteum is not formed, which produces the hormone progesterone and affects the increase in basal body temperature. In this case, the temperature rise is not visible on the basal temperature chart and ovulation is not detected. If there is no ovulation line on the chart, in this case we are talking about an anovulatory cycle.
Each woman can have several anovulatory cycles a year - this is normal and does not require medical intervention, but if this situation repeats from cycle to cycle, be sure to consult a gynecologist. Without ovulation - pregnancy is impossible!
A monotonic curve occurs when there is no pronounced rise throughout the cycle. Such a schedule is observed during an anovulatory (ovulation is absent) cycle. See chart examples below.
On average, a woman has one anovulatory cycle per year and there is no cause for concern in this case. But anovulatory schedules that are repeated from cycle to cycle are a very serious reason to contact a gynecologist. Without ovulation, a woman cannot become pregnant and we are talking about female infertility.
estrogen deficiency
Chaotic temperature curve. The graph shows large temperature swings, it does not fit into any of the above types. This type of curve can be observed both in severe estrogen deficiency and depend on random factors. Chart examples below.
A competent gynecologist will definitely require testing for hormones and conduct an ultrasound examination before prescribing medications.
High basal temperature in the first phase
The basal temperature graph is divided into the first and second phases. The separation takes place where the ovulation line (vertical line) is affixed. Accordingly, the first phase of the cycle is the segment of the graph before ovulation, and the second phase of the cycle after ovulation.
Estrogen deficiency
In the first phase of the cycle in the female body, the hormone estrogen dominates. Under the influence of this hormone, the basal temperature before ovulation is kept on average in the range from 36.2 to 36.5 degrees. If the temperature in the first phase rises and stays above this mark, then estrogen deficiency can be assumed. In this case, the average temperature of the first phase rises to 36.5 - 36.8 degrees and is kept at this level. To increase the level of estrogen, gynecologists-endocrinologists will prescribe hormonal drugs.
Estrogen deficiency also leads to an increased temperature in the second phase of the cycle (above 37.1 degrees), while the rise in temperature is slow and takes more than 3 days.
On the example of the graph, the temperature in the first phase is above 37.0 degrees, in the second phase it rises to 37.5, the rise in temperature by 0.2 degrees on the 17th and 18th day of the cycle is insignificant. Fertilization in a cycle with such a schedule is very problematic.
Inflammation of the appendages
Another reason for an increase in temperature in the first phase may be inflammation of the appendages. In this case, the temperature rises only for a few days in the first phase to 37 degrees, and then drops again. In such charts, ovulation calculation is difficult because such a rise "masks" the ovulatory rise.
On the example of the graph, the temperature in the first phase of the cycle is kept at 37.0 degrees, the increase occurs sharply and also falls sharply. A rise in temperature on day 6 of the cycle can be mistaken for an ovulatory rise, but in fact it most likely indicates inflammation. Therefore, it is so important to measure the temperature throughout the cycle in order to exclude such a scenario: the temperature rose due to inflammation, then fell again and then rose due to the onset of ovulation.
endometritis
Normally, the temperature in the first phase should decrease during menstrual bleeding. If your temperature at the end of the cycle drops before the onset of menstruation and rises again to 37.0 degrees with the onset of menstruation (less often on day 2-3 of the cycle), then this may indicate the presence of endometritis.
Characteristically, the temperature drops before menstruation and rises with the beginning of the next cycle. If there is no drop in temperature before the start of menstruation in the first cycle, i.e., the temperature is kept at this level, then pregnancy can be assumed, despite the onset of bleeding. Take a pregnancy test and consult a gynecologist who will conduct an ultrasound for an accurate diagnosis.
If the basal temperature in the first phase rises sharply for one day, then this does not mean anything. Inflammation of the appendages cannot begin and end in one day. Also, a lack of estrogen can only be assumed by evaluating the entire graph, and not a separate temperature in the first phase. In diseases accompanied by high or elevated body temperature, it makes no sense to measure basal temperature, and even more so to judge its nature and analyze the graph.
Low temperature in the second phase of the menstrual cycle
In the second phase of the cycle, the basal temperature should differ significantly (by about 0.4 degrees) from the first phase and be at the level of 37.0 degrees or higher if you measure the temperature rectally. If the temperature difference is less than 0.4 degrees and the average temperature of the second phase does not reach 36.8 degrees, then this may indicate problems.
Insufficiency of the corpus luteum
In the second phase of the cycle, the female body begins to produce the hormone progesterone or the corpus luteum hormone. This hormone is responsible for raising the temperature in the second phase of the cycle and prevents the onset of menstruation. If this hormone is not enough, then the temperature rises slowly and the onset of pregnancy may be at risk.
The temperature in case of corpus luteum insufficiency rises shortly before menstruation, and there is no "premenstrual" fall. This may indicate hormonal deficiency. The diagnosis is based on a blood test for progesterone in the second phase of the cycle. If its values are lowered, then usually the gynecologist prescribes a progesterone substitute: utrogestan or duphaston. These drugs are taken strictly after the onset of ovulation. With the onset of pregnancy, the reception continues until 10-12 weeks. Abrupt withdrawal of progesterone in the second phase during pregnancy can lead to the threat of termination of pregnancy.
Particular attention should be paid to charts with a short second phase. If the second phase is shorter than 10 days, then one can also judge the insufficiency of the second phase.
Situations when the basal temperature remains elevated for more than 14 days occur during pregnancy, the formation of an ovarian corpus luteum cyst, and also in an acute inflammatory process of the pelvic organs.
Estrogen-progesterone deficiency
If, in combination with a low temperature in the second phase, your graph shows a slight rise in temperature (0.2-0.3 C) after ovulation, then such a curve may indicate not only a lack of progesterone, but also a lack of the hormone estrogen.
Hyperprolactinemia
Due to the increase in the level of the pituitary hormone - prolactin, which is responsible for maintaining pregnancy and lactation, the basal temperature graph in this case may resemble the graph of a pregnant woman. Menstruation, as well as during pregnancy, may be absent. An example of a basal temperature chart for hyperprolactinemia
Basal temperature chart for ovulation stimulation
When ovulation is stimulated, in particular with clomiphene (clostilbegyt) using duphaston in the second phase of the mc, the basal temperature graph, as a rule, becomes "normal" - two-phase, with a pronounced phase transition, with a fairly high temperature in the second phase, with characteristic "steps" (the temperature rises 2 times) and a slight sinking. If the temperature schedule during stimulation, on the contrary, is violated and deviates from the normal, this may indicate an incorrect selection of the dose of drugs or an inappropriate stimulation scenario (other medications may be needed). An increase in temperature in the first phase during stimulation with clomiphene also occurs with individual sensitivity to the drug.
Special cases of the basal temperature chart
Low or high temperature in both phases, provided that the temperature difference is at least 0.4 degrees, is not a pathology. This is an individual feature of the body. The measurement method can also affect the temperature values. Typically, with an oral measurement, the basal temperature is 0.2 degrees lower than with a rectal or vaginal measurement.
When to contact a gynecologist?
If you strictly observe the rules for measuring temperature and observe the described problems on your basal temperature graph for at least 2 cycles in a row, contact your doctor for additional examinations. Beware of making diagnoses by a gynecologist only on the basis of charts. What you need to pay attention to:
anovulatory charts
regular cycle delays in case of non-approaching pregnancy
late ovulation and not getting pregnant for several cycles
controversial schedules with indistinct ovulation
high temperature charts throughout the cycle
low temperature curves throughout the cycle
schedules with a short (less than 10 days) second phase
charts with high temperature in the second phase of the cycle for more than 18 days, without the onset of menstruation and a negative pregnancy test
unexplained bleeding or heavy discharge mid-cycle
heavy menstruation lasting more than 5 days
graphs with a temperature difference in the first and second phases of less than 0.4 degrees
cycles shorter than 21 days or longer than 35 days
graphs with well-defined ovulation, regular intercourse during ovulation and no pregnancy for several cycles
Signs of probable infertility according to the basal temperature chart:
The average value of the second phase of the cycle (after the temperature rise) exceeds the average value of the first phase by less than 0.4°C.
In the second phase of the cycle, there are drops in temperature (the temperature drops below 37°C).
The rise in temperature in the middle of the cycle lasts more than 3-4 days.
The second phase is short (less than 8 days).
Definition of pregnancy by basal temperature
The method of determining pregnancy by basal temperature works subject to the presence of ovulation in the cycle, since with some health disorders, the basal temperature can be increased for an arbitrarily long time, and menstruation may be absent. A striking example of such a violation is hyperprolactinemia, due to increased production of the hormone prolactin by the pituitary gland. Prolactin is responsible for maintaining pregnancy and lactation and is normally elevated only during pregnancy and lactation (see Examples of graphs for normal and various disorders).
Fluctuations in basal temperature in different phases of the menstrual cycle are due to different levels of hormones responsible for phases 1 and 2.
During menstruation, the basal temperature is always elevated (about 37.0 and above). In the first phase of the cycle (follicular) before ovulation, the basal temperature is low, up to 37.0 degrees.
Before ovulation, the basal temperature decreases, and immediately after ovulation it rises by 0.4 - 0.5 degrees and remains elevated until the next menstruation.
In women with different lengths of the menstrual cycle, the duration of the follicular phase is different, and the length of the luteal (second) phase of the cycle is approximately the same and does not exceed 12-14 days. Thus, if the basal temperature after the jump (which indicates ovulation) remains elevated for more than 14 days, this clearly indicates the onset of pregnancy.
This method of determining pregnancy works subject to the presence of ovulation in the cycle, since with some health disorders, the basal temperature can be increased for an arbitrarily long time, and menstruation may be absent. A striking example of such a violation is hyperprolactinemia, due to increased production of the hormone prolactin by the pituitary gland. Prolactin is responsible for maintaining pregnancy and lactation and is normally elevated only during pregnancy and lactation.
If a woman is pregnant, then menstruation will not occur and the temperature will remain elevated throughout the pregnancy. A decrease in basal temperature during pregnancy may indicate a lack of hormones that maintain pregnancy and the threat of its termination.
With the onset of pregnancy, in most cases, on the 7th - 10th day after ovulation, implantation occurs - the introduction of a fertilized egg into the endometrium (the inner lining of the uterus). In rare cases, early (before 7 days) or late (after 10 days) implantation is observed. Unfortunately, it is impossible to reliably determine the presence of implantation or its absence either on the basis of the schedule or with the help of ultrasound at a gynecologist's appointment. However, there are several signs that may indicate implantation has taken place. All these signs can be detected on the 7-10th day after ovulation:
It is possible that these days there are small discharges that disappear within 1-2 days. This may be the so-called implantation bleeding. At the time of the introduction of the egg into the inner lining of the uterus, the endometrium is damaged, which leads to minor discharge. But if you have regular discharge in the middle of the cycle, and pregnancy does not occur, then you should contact the gynecology center.
A sharp decrease in temperature to the level of the midline for one day in the second phase, the so-called implantation retraction. This is one of the signs most often observed in charts with confirmed pregnancy. This retraction can occur for two reasons. Firstly, the production of the hormone progesterone, which is responsible for raising the temperature, begins to decline from the middle of the second phase, when pregnancy occurs, its production resumes again, which leads to temperature fluctuations. Secondly, during the onset of pregnancy, the hormone estrogen is released, which in turn lowers the temperature. The combination of these two hormonal shifts leads to the appearance of implantation depression on the graph.
Your chart has become triphasic, which means you are seeing an ovulation-like rise in temperature on the chart during the second phase of your cycle. This rise is again due to increased production of the hormone progesterone after implantation.
On the example of the graph - implantation retraction on the 21st day of the cycle and the presence of the third phase, starting from the 26th day of the cycle.
Early signs of pregnancy such as nausea, tightness in the chest, frequent urination, indigestion, or just feeling pregnant also do not give an accurate answer. You may not be pregnant if you have all of these signs, or you may be pregnant without a single symptom.
All these signs can be a confirmation of the onset of pregnancy, but you should not rely on them, since there are many examples in which the signs were present, but the pregnancy did not occur. Or, conversely, with the onset of pregnancy, there were no signs. The most reliable conclusions can be drawn if there is a clear rise in temperature on your chart, you had intercourse 1-2 days before or during ovulation, and your temperature remains high 14 days after ovulation. In this case, the time has come to take a pregnancy test, which will finally confirm your expectations.
Basal temperature measurement is one of the main fertility tracking methods recognized by the World Health Organization (WHO). for details, see the WHO document "Medical Eligibility Criteria for the Use of Contraceptive Methods" page 117.
When using the basal temperature method to prevent unwanted pregnancy, you need to consider that not only the days of ovulation according to the basal temperature schedule can be dangerous. Therefore, in the period from the beginning of menstruation until the evening of the 3rd day after the rise in basal temperature, which occurs after ovulation, it is better to use additional measures to prevent unwanted pregnancy.
Our regular reader, Natalya Gorshkova, has compiled a form for you to quickly fill out and automatically plot a basal temperature chart, which you can print out and show to your doctor. You can download it from the link: schedule form.
Charts are discussed on the forum
Attention! It is impossible to make any diagnoses only on the basis of basal temperature charts. Diagnosis is made on the basis of additional examinations conducted by a gynecologist.
Most women have heard about such a concept as “basal temperature” more than once, but few understand what this medical term means, why it is necessary to control this indicator and how to decipher the BT schedule for a pregnant and non-pregnant woman. We'll help you figure it out.
Basal temperature - what is it?
Basal body temperature is the minimum indicator that is observed after prolonged sleep and rest. Various processes in a woman's body increase BT indicators, it is thanks to this feature that changes in the hormonal background can be determined during. Deviations in indicators are a signal of certain violations in the functioning of systems and organs. For example, pregnant women are often monitored. BBT charts with a low temperature in phase 2 may indicate a threatened miscarriage. And similar indicators in a non-pregnant woman indicate infertility.
Why determine basal temperature?
Analyzing changes in BT, the following pathologies are determined:
- The presence or absence of ovulation.
- The information obtained can be used both for pregnancy planning and for the calendar method of contraception.
- Cycle disorders. In case of deviation from the norm, the doctor may suspect some diseases of the reproductive system, such as the presence of an inflammatory process or insufficiency of the luteinizing phase, as well as hormonal disorders.
- With the help of BBT indicators, you can find out about pregnancy at an early stage. The BT schedule for a pregnant woman has its own characteristics, which are described in more detail below.
How to measure BT?
How to measure basal body temperature? To do this, stock up on a separate thermometer, preferably mercury. BBT is measured in the mouth, vaginally and rectally. The latter method is considered the most preferable, since the results of such measurements are the most reliable due to the minimal influence of external factors. BT is not measured in the armpit. It is necessary to choose only one method, without changing it throughout the entire diagnostic period, which is at least 3 months. Measurements should be taken in the morning, after at least 6 hours of sleep, without getting out of bed, preferably at the same time.
Observe changes in the basal temperature of women with menstrual irregularities, pregnant women. BT schedules for planning girls will become indispensable helpers in determining favorable days
It is necessary to start recording BBT indicators on the first day of menstruation (the beginning of the cycle) in order to obtain complete information for the monthly period. Women who are pregnant should schedule BT regularly throughout the first trimester.
It is recommended to record the results immediately after the measurement, as an error can affect the diagnosis and interpretation of the indicators. In addition to indicating the temperature itself, it is necessary to indicate the day of the cycle, the number of days of menstruation. It is extremely important to note additional factors that may affect the measurement results: medication, lack of sleep, illness, stress, physical activity, sexual intercourse on the eve of the measurement, consumption of spicy foods and alcohol. The schedule of BT of a pregnant woman, in addition to the above factors, should reflect the well-being and feelings of a woman.
Keeping BT records
You can record data in a notebook, but it is more convenient to use online applications or computer programs to record and analyze measurements of basal body temperature. This will decipher the BT schedule for a pregnant and non-pregnant woman: determine ovulation, calculate the average temperature of each phase of the cycle, highlight deviations from the norm, and give recommendations. But do not forget that the resulting software decoding is only preliminary generalized data that cannot be a diagnosis and a guide to self-treatment. The recorded results must be shown to the attending gynecologist. Pregnant women should pay special attention to the results obtained. BBT charts with a low temperature should be shown to the attending physician.
Change in BBT throughout the menstrual cycle
In order to understand the principle on which the diagnostic method using basal temperature is based, it is important to understand what processes in a woman's body are associated with changes in temperature indicators.
The monthly menstrual cycle in medicine is usually divided into 4 phases:
- Menstrual - begins on the first day of menstrual flow. This day is also considered the first day of a woman's monthly cycle. During this period, the body rejects the endometrium and prepares at the hormonal level for the development of a new egg. This phase lasts up to 7 days. BBT during this period should normally correspond to 36.2-36.6 degrees.
- This is followed by the follicular phase. During this period, the body intensively produces which promotes the development of follicles, and subsequently - the egg. This period of the menstrual cycle lasts up to two weeks. The basal temperature in the follicular phase rises slightly and is normally 36.7-36.9 degrees. In a day or two, there is a pre-ovulatory temperature drop - up to 36.3 degrees.
- The ovulatory phase lasts about 3 days. This period is characterized by a decrease in the production of follicle-stimulating hormone and an increase in the level of luteinizing hormone. Thanks to the latter, the egg is released from the follicle - this process is called ovulation. This is the most favorable time for conceiving a baby. The basal temperature during the period of ovulation rises and reaches up to 37.7-37.9 degrees.
- The last phase, luteinizing, is characterized by the intensive production of progesterone to maintain pregnancy in the event of its occurrence. The basal temperature in this phase remains above 37 degrees. In the absence of fertilization of the egg, the temperature indicators drop sharply 1-2 days before the expected menstruation and amount to 36.6-36.8 degrees. After that, a new cycle begins.
The BBT schedule of a pregnant woman (after conception) should normally look like a monotonous straight line with BBT values above 37 ° C.
Norms of BT indicators
With basal temperature indicators that correspond to the established norms, at the end of the monthly cycle, the curve of the resulting graph will have a clearly defined two-phase separation. So, in the first half of the cycle, the line will pass below 36.8. A few days before ovulation, a pre-ovulatory decrease in temperature will be noted, after which a sharp increase in indicators by at least 0.4 degrees will be noted. The jump is separated by a red line - this is the day of ovulation. After that, the elevated temperature lasts up to 14 days, then a premenstrual drop in the indicator is recorded.
BT during pregnancy: normal
If within 16 days after ovulation the thermometer shows more than 37 degrees, this may indicate pregnancy. If conception has occurred, the egg is attached to the wall of the uterus. Progesterone and the "pregnancy hormone" - hCG - begin to be produced. When women are pregnant, BBT charts show a temperature of 37-37.6 o C. In 25% of cases, in the early stages of embryo development, an increase in indicators to 38 o is observed. In addition, with normal production of progesterone, there will be no premenstrual decline in basal temperature.
When conception is confirmed, doctors recommend continuing the schedule throughout the first trimester. It is especially important to keep a schedule of BT for a pregnant woman who has had miscarriages or a fading of the embryo at an early stage in history. At a later date, such a procedure turns out to be uninformative due to changes in the hormonal background.
On sites for expectant mothers, forums, you can view the so-called "pregnant" BT charts. A photo showing normal indicators during the menstrual cycle, accompanied by conception, is presented below.
Implantation retraction - what is it?
Often there are "pregnant" BT schedules with implantation retraction - a sharp decrease in temperature approximately 5-7 days after ovulation. The next day, the indicators return to a level above 37 degrees. Such a temperature change is observed during the period when the fertilized egg is attached to the wall of the uterus. Fixing on the chart is considered a sign of pregnancy. In addition to a sharp jump in temperature, sometimes there may be slight spotting discharge from the genitals and pulling sensations in the lower abdomen. But if, simultaneously with such symptoms, a woman observes “pregnant” schedules with low BBT, this is a serious reason for urgently seeking medical help - there is a risk of miscarriage.
BT during pregnancy: deviations
Deviations from the established norms of basal temperature indicators often indicate various violations, sometimes dangerous conditions of a pregnant woman and baby. If you followed all the measurement rules, and the thermometer records readings below 37 or above 38 degrees, an urgent consultation with a specialist is necessary. You need to pay attention to the state of health in the following situations:
- In previous cycles, the basal temperature in the post-ovulation period was 37-37.3 o C, and during pregnancy it jumped sharply to 38. Such a change in indicators may indicate the presence of various kinds of inflammatory processes in the body. It is required to undergo a series of tests and diagnostic procedures to make a correct diagnosis. But if even before pregnancy the temperature in the second half of the cycle was close to 38, there is no reason for concern, in this case, high BT rates are individual characteristics of the body.
- "Pregnant" BT schedules with low temperature in phase 2 require urgent medical attention. Indicators below 37 degrees indicate a lack of progesterone - this is extremely dangerous during pregnancy. A decrease in hormone levels can threaten spontaneous abortion (miscarriage). With the timely diagnosis of a pathological condition, it is possible to normalize the level of progesterone by taking synthetic drugs. In this case, the probability of maintaining and further normal development of pregnancy is high. Another reason for a decrease in temperature can be a frozen pregnancy. Unfortunately, in this case, it is not possible to save the fetus. Such a diagnosis must be confirmed by ultrasound diagnostics. If pregnancy is confirmed, the doctor will prescribe curettage of the uterine cavity for medical reasons.
Norm and deviations of the basal temperature curve
We discussed above what the normal BT indicators should be in a certain period of the menstrual cycle. Now let's figure out what types of graphs are there that indicate deviations in health status:
- If in the second half of the cycle the basal temperature rises only slightly (up to 0.3 degrees) and such curves are recorded for several cycles in a row, the doctor may suspect a hormonal imbalance: a lack of progesterone is possible. Such deviations lead to the absence of ovulation and, consequently, to infertility.
- In most cases, women face problems in carrying a child, whose basal temperature rises only a few days before menstruation, and the duration of the second half of the cycle is 10 days or less. In addition, there is no decrease in temperature before the onset of menstruation. In such a situation, doctors talk about the insufficiency of the second phase of the cycle, the threat of miscarriage. Timely detection of pathology is corrected by medication.
- The graph curve, which does not have a pronounced decrease and increase in temperature, and according to the results of the indicators, it is not possible to divide the cycle into separate phases, indicates the absence of ovulation. This cycle is called anovulatory. During the year, a woman can normally have 1 cycle without ovulation. But if such a schedule is fixed for three months or more, you need to contact a gynecologist for an examination. With such indicators of basal temperature, pregnancy is impossible. An example of such a graph is shown below.
- The zigzag, chaotic curve of the basal temperature graph indicates a lack of estrogen in the woman's body. This leads to a lack of development of follicles, and subsequently the egg. And as a result - anovulation and infertility. Be sure to seek the advice of a specialist when fixing these types of schedules for more than three cycles in a row.
Measurement of basal temperature is an effective and affordable home method for diagnosing various pathologies in a woman's body. The schedule of BT for a pregnant woman is extremely important - timely identification of the problem can save the life of the unborn baby and mother. But do not self-medicate - in case of temperature deviations from the norm, consult a gynecologist for advice.