What indicators of basal temperature are considered normal before menstruation?


Anyone who plans a baby in the near future or simply monitors their health is interested in the characteristics of the body. Many women measure basal temperature, because it helps to understand whether the reproductive system is functioning normally. To determine whether everything is in order, it is necessary to know what indicators a woman should have during different periods of the cycle.

Measurement rules

Before talking about specific values, it is important to find out exactly how the basal temperature should be measured before the monthly. The most accurate readings will be only subject to a number of conditions. So, it is desirable to engage in measurements at the same time, in the morning, until the moment when a woman gets out of bed. Doctors recommend to monitor the basal temperature, and not to take measurements in the mouth or armpit. It is believed that in the rectum it is most reliable.

It is also important to sleep at least 4 hours before the measurement. In addition, it must be remembered that during diseases that are accompanied by an increase in temperature, it makes no sense to carry out such measurements, the picture will be distorted. Any intestinal disorders, significant changes in the daily regimen, intake of sleeping pills, alcohol can also affect the morning indicators. These days, the temperature can not be measured or not taken into account when calculating the average values.


It should be noted that there are general averaged indicators of what should be the basal temperature before menstruation and after them, during ovulation, as well as during other periods of the cycle. But each organism is individual, therefore, in order to understand whether there are problems with the reproductive system, it is necessary to regularly record the obtained values ​​and build graphs. Possible diseases are judged by temperature fluctuations, by the difference of indicators in the first and second phases, by the nature of their changes. The graph is constructed as follows: the days of the cycle are marked on the horizontal axis, and the measurement values ​​are on the vertical axis. Normally, it should be clearly traced in two phases. In the first of these, the temperature is lower and is at the level of 36.5 degrees, and in the second, which occurs after the release of the egg, it rises to 37 or more. To understand if there are any problems, doctors recommend counting average values ​​in each of the phases. The difference between them should be at least 0.4 degrees.

Cyclical changes

If the indicators in the first and second phases are clear, then the question of what should be the basal temperature before menstruation worries many women. Ideally, in the second phase, which begins after ovulation, the values ​​should be above 37 degrees. By the beginning of the month they may decline slightly. The first days of menstruation are characterized by the fact that the temperature drops every day, reaching the end of 36.5-36.8 degrees.

Before ovulation, it can fall even more and rise sharply immediately after the release of the egg. This indicates that the second phase has begun. If you measure the indicators regularly, then the deviation of the values ​​can be suspected various problems. Despite the fact that many people talk about the senselessness of measurements during critical days, the temperature during this period can suggest which aspects of women's health should be paid attention to. The basal temperature during menstruation should fall, if this does not happen, then it is worth thinking about passing an examination.

Possible diseases

On average, a couple of days before the start of discharge, indicators should start to decrease. A gradual decrease in temperature should also occur during critical days. If instead of a decrease during menstruation, there is a sharp rise to indicators of about 37.6 degrees, then this may indicate the development of endometritis or endomyometritis. Of course, an increased basal temperature during menstruation should be alerted, but it is unacceptable to make a diagnosis from only one measurement.

But in the case when the temperature in the second phase barely reaches 37 degrees, but with the onset of critical days rises above this level, inflammation of the appendages can be suspected. In addition, measurements provide an opportunity to identify problems with the tubes or cervix. Talking about the likely inflammation of these organs is in cases where the temperature increases by the 4th-5th day of menstruation. It is necessary to carefully consider those cases where the basal temperature before menstruation is 37.2. If it does not significantly fall off with the onset of critical days, then it is better to do a test. Perhaps this is a threatened pregnancy. But if the temperature rose by one day, then you should not worry, it still does not mean anything. Also do not forget, for making a diagnosis it is not enough just measurements, for this you will need to undergo a series of examinations.

First phase

Having dealt with the temperature during critical days, you can figure out how the body should behave after they end. Normally, the thermometer readings should be at around 36.6, but they will depend on the personal characteristics of each girl or woman. In some, they will keep the entire first phase at 36.4, in others they can rise to 36.8 degrees. But both cases described are quite acceptable.

But a more significant temperature rise indicates that a woman is better to consult with a gynecologist. If the figures in the first phase are approaching the mark of 37 degrees, then this may indicate a lack of estrogen. But this can only be confirmed with a blood test for hormones. It is also worth guarding in case of a rise in basal temperature during menstruation and its periodic increase by 1-2 days throughout the first phase to the level of 37 degrees and above. This may indicate inflammation.

Ovulation rates

Unusual basal temperature before menstruation or during their passage may indicate a number of problems. But measurements on other days are no less indicative. Normally, the next morning after the release of the egg, the woman observes a rise in temperature. It can be both sharp and gradual. For some, on the very first day it increases by 0.4 degrees, for others this difference is accumulated in 2-3 days. Both of these situations are quite acceptable. In the case when the rise in values ​​takes more than 3 days, one may suspect the inferiority of the ovum released from the ovary or the lack of estrogen. As a rule, getting pregnant in such a cycle is almost impossible.

Beginning of the second phase

If the figures after the release of the egg does not reach 37 degrees, this may indicate the inferiority of the corpus luteum. But talking about the insufficiency of the second phase only in terms of temperature is not worth it. It is important to look not at the indicators themselves, but at the difference of the values ​​that were in the first and second part of the cycle. If the measurements are carried out in degrees Celsius, then it will be 0.4 or even higher with the normal functioning of the organism. Although to put some diagnoses without a survey is not worth it. Failure of the second phase and the appointment of progesterone drugs is possible only after carrying out an appropriate analysis.

End of second phase

Regardless of exactly what values ​​a woman had after ovulation and before her, the basal temperature before menstruation should begin to decrease. At the same time, its value by the first day of the cycle normally should not exceed 37 degrees. If, according to the schedule, ovulation has passed more than 14 days ago, and the temperature does not fall, then a test can be done that helps in the early stages to diagnose the conception of a baby. Basal temperature before menstrual 37 degrees is considered normal. But it is important that it decreases with the onset of discharge. If menstruation has begun, and the fever has lasted a few more days and has fallen only by the end of the critical days, this may indicate a terminated pregnancy.

Phase duration

In addition to information about what basal temperature before menstruation should be, it is important to know how long each part of the cycle can last. Thus, the length of only the second part is relatively constant, depending on the characteristics of the body of each particular woman, it can be 12-16 days. But the ideal is the option in which it lasts 14 days. But the lengthy first part of the cycle can vary from 10-12 days to several weeks. Of course, with a cycle of 28 days, it lasts about 14 days, during which time it manages to mature the follicle and ovulation occurs. But for a number of women, it can be much longer. At the same time, all the necessary stages go through their bodies: the growth and maturation of the follicle, the release of the egg, the formation and functioning of the corpus luteum.

Standard options

Talk about some diseases only in terms of temperature is not worth it. But this information is needed in order to suspect any problems and to undergo the necessary research to confirm or refute the diagnosis. At the same time it is impossible to judge only one cycle, it is necessary to take measurements for at least three months. If the picture is repeated every month, then together with the gynecologist, you can draw any conclusions by analyzing how the basal temperature changes before the menstrual periods. The norm for it cannot be set in absolute values. It depends on both the values ​​in the second and in the first phase. If a woman has indicators before ovulation are around the mark of 36.4 degrees, then after it they may not exceed 36.9. At the same time, an increase in the temperature to 37 by the day will not speak about the approaching critical days, but about the onset of pregnancy.

Anovulatory cycles

Ideally, a woman should have a two-phase basal temperature chart. Before menstruation, it decreases slightly, but at the same time, the difference between the average indices of the first and second half of the cycle fit into the norm. But it is quite acceptable if once or twice a year ovulation is absent. In this case, the indicators may change every day, the temperature may rise sharply, then fall. This does not indicate any problems, there will be no ovulation this month.

Important nuances

If on which of the days on the eve of the measurements the normal day routine was disturbed, then the temperature will not be indicative. If you drank alcohol in the evening, got up a couple of hours before the measurement in the toilet or in the morning there was proximity, then the values ​​obtained may differ significantly. Even a banal upset stomach or stress the day before can cause fluctuations in the temperature curve. This, by the way, is one of the reasons why it is impossible to judge a woman’s state of health only on the basis of a single chart. But it should also be noted that even the ideal schedule, in which two distinct phases emerge with a good difference in performance, and the basal temperature before the menstrual period is 36.9 degrees, does not mean that everything is good with a woman. For example, measurements will not give any information about the size of the endometrium in the uterus or about the spikes in the tubes. Therefore, even with normal indicators, it is not worth neglecting visits to the gynecologist.

Basal temperature - what is it?

Under the influence of physiological processes, the temperature inside the human body is constantly changing. Hormones, which on different days of the menstrual cycle have different concentrations, have a special influence on the female reproductive system. They influence the internal temperature indicators, when the woman is healthy.

However, when fixing the temperature in the armpit, minor changes will not be noticeable. To catch the slightest fluctuations in indicators allows measurement of basal temperature. BT is the smallest daily indicator of body temperature, which is recorded at the time of a person's awakening after a full sleep.

The basal temperature differs from the usual in that it is measured only on the mucous membranes. It is measured in three ways:

Of these methods, rectal was considered the most reliable. BT is widely used in gynecological practice as a method of diagnosis and control. However, in order to measure the basal body temperature wore an informative character, it is necessary to take measurements and record the indicators every day for several cycles.

What can basal temperature talk about?

On the basis of daily data, a woman can follow an individual graph of temperature fluctuations in different phases of the monthly cycle. Fixing the basal temperature allows you to identify:

  • Start and end of the menstrual stage. Each phase corresponds to certain temperature indicators. Based on the data, the duration of each of them is tracked.
  • Favorable days for conception. During the cycle there is only one day when the egg is ready for fertilization. BT allows you to identify this period.
  • The development of the inflammatory process in the reproductive system. The body of each woman is individual. However, there are general regulatory temperature indicators. If the temperature significantly deviates from the norm, this indicates the development of the disease. Pathology is also detected in the case when the current temperature chart differs from the previous ones.
  • The onset of pregnancy. The internal temperature after fertilization remains stable throughout the entire period of gestation of the baby. Stability indicators after ovulation says fertilization.
  • Hormonal disorders. Abnormalities in the hormonal system also indicate abnormalities. Each phase of the menstrual cycle is affected by a particular hormone. Depending on its concentration, BT changes. If the hormone is insufficient or in excess, the temperature will deviate from the norm.

Graphs of basal temperature allow gynecologists to confirm infertility, pregnancy, diagnose the threat of miscarriage and hormonal deficiency. Separately, this diagnostic method is not used, however, in conjunction with other methods, it allows to obtain reliable results. Informative data are considered for 3 months or more.

How is BT measured?

The peculiarity of the basal temperature is that its indicators are influenced by many factors. Significantly distort the data:

  • diseases associated with fever (colds, viral and bacterial infections),
  • alcohol drinks on the eve,
  • short sleep,
  • sharp movements
  • eating, drinking,
  • change of measurement time,
  • overheating or overcooling of the body,
  • endocrine pathologies,
  • medications.

To obtain a reliable result, it is necessary to measure the temperature in the rectum. Use a mercury or electronic thermometer. However, it should be taken into account that the electronic instrument shows the result in about 1 minute, and the mercury instrument - in 5–7 minutes. Basic rules for measuring BT:

  • The temperature is measured in the morning immediately after waking up. The night before, you need to put the measuring device in a place where you can get it without getting out of bed. Measurements are recommended from 6 to 7 in the morning.
  • For measurements, always use the same measuring device. If for any reason this is not possible, a similar one should be purchased.
  • Thermometer need to enter about 2 cm inside the rectum. You can't get out of bed. The thermometer is inserted in the prone position on its side or abdomen.
  • Sleep on the eve of measurements should be at least 5 hours. The most reliable information is detected during night sleep for more than 6 hours.
  • You can not change the measurement time. Allowed fluctuations within 1-2 hours.
  • When scheduling BT can not take hormones. Drugs affect the natural hormone levels, so the information is not indicative.
  • If on the eve of the measurement there were factors affecting the results, it is necessary to note this in the graph.

What should be BT on the eve of menstruation?

However, there are norms for changes that need to be oriented. To determine personal indicators that indicate a particular phase of the cycle, the following should be considered:

  • on the first day of the cycle (the beginning of menstruation) the indicator reaches 36.7–37 degrees,
  • then the temperature decreases, on the last day of menstruation it approaches 36.2–36.6,
  • when the egg is mature, the temperature index is 36.6–36.9,
  • on the eve of ovulation on the thermometer there is a decrease of 0.2 degrees,
  • on the day the egg cell leaves the follicle, the thermometer bar rises sharply and shows from 37 to 37.5 degrees,
  • further indicators may fall by 0.1–0.2 degrees, but will stay above 37,
  • if fertilization has not occurred, the temperature will decrease by 0.2–0.4 degrees before the menstruation.

Thus, the basal temperature indicators before menstruation depend on the time remaining until the beginning of the menstrual cycle.

What does raising BT on different days of the cycle mean?

Повышение базальной температуры в разные дни цикла происходит по естественным причинам и в результате патологических процессов в организме. Рост БТ в середине цикла обусловлен влиянием эстрогенов, которые способствуют выходу яйцеклетки из фолликула. Further maintaining high rates provides progesterone, preparing the body for the onset of pregnancy.

If after ovulation the temperature remains consistently high, fertilization has occurred. In this case, there will be no further decline in BT, the monthly will not begin. However, the high temperature during menstruation, elevated rates in front of them or during the period of maturation of the follicle indicate the development of the pathology of the genitourinary system.

Possible deviations and diseases are described in the table.

How to measure it

Basal temperature - changes in temperature, recorded rectally, orally or vaginally in a woman immediately after a night's sleep.

Regardless of the method, for an accurate measurement result, some rules should be followed:

  • The selected measurement method should be applied only one. If in this cycle you started to measure BT in the anus, then continue until menstruation. And only in the next cycle can the method be changed,
  • Temperature indicators are recorded daily for at least 3-5 months in a special schedule.
  • Measurements are made early in the morning at a fixed time immediately after the woman wakes up.
  • During periods of measurement, deep sleep should be at least 3-5 hours. That is, if you got up to the toilet in the morning, 1-2 hours before getting up, the measurement result will be inaccurate,
  • The schedule should reflect not only the basal temperature figures, but also the factors affecting its changes: stress, sexual contact, alcohol or drug intake, change in study time. All this can suddenly increase BT. Therefore, make notes under the schedule. For example: "5 ds - woke up 3 hours later."

But these are not all important nuances. Read a detailed article on how to make a basal temperature chart and how to interpret it.

BT in different phases of the cycle

The female body is a complex mechanism that is controlled by numerous hormones. They influence the digital temperature changes in different cyclical phases: it decreases or rises. That is, the schedule clearly demonstrates two phases: before ovulation and after it.

The basal temperature in the second phase of the cycle is an important indicator of how the female organs function. But to measure it only at this time is not enough: you need to see the whole “picture” as a whole, that is, measurements of BT are important for a whole month, and preferably several.

Let us analyze what basal temperature should be on different cyclic phases in a non-pregnant young woman.

Luteal Phase (Second Phase)

The temperature after ovulation increases and reaches maximum figures (37-37.5 degrees). This happens because of the active production of the hormone progesterone.

At the final stage of the luteal phase, the indicators again begin to decline slightly. Basal temperature of 36.8-37 degrees is considered to be optimal before monthly periods (2-4 days).

Your rectal temperature before menstruation may not coincide with the reference. The difference of plus or minus 0.3 degrees is considered the norm, because each of us has its own characteristics. That is why it is extremely important to conduct research for several months in order to identify "their" indicators.

However, the main thing here is the general trend: the basal temperature in the second phase of the cycle rises by 0.4-1 degrees, and a few days before menstruation (for 2-3 days) decreases slightly (by 0.2-0.4 degrees).


Sometimes the results of basal temperature readings before menstruation may have indications that differ from the standard. The reason for these changes lies in the failure of hormones, which is due to two factors:

  • Deviations in the functioning of the reproductive system,
  • The onset of conception.

Let us analyze the features of deviations of rectal parameters, when the graph of BT indicates the presence of diseases of the female urogenital sphere.

Anovulatory cycle

Monophasic graph, when the measurements are fixed almost at the same level, indicates the absence of ovulation. In this case, the basal temperature is low in the second phase. This situation is caused more often by hormonal problems. Regardless of the reason, a woman cannot become pregnant.

Almost every woman 1-2 times a year can fix an anovulatory cycle. In this case, there is no reason to worry. However, if the schedule for a long time shows a monotonous direct, consultation of the gynecologist to identify and eliminate the causes is necessary.

Progesterone deficiency

Lack of hormone progesterone provokes a condition called progesterone deficiency. Because of the disease, temperature indicators rise very little and do not reach 37 degrees a week before menstruation.

A distinctive feature of the disease is the shortened second phase of the cycle, which causes the appearance of menstrual bleeding ahead of time.

Inflammatory diseases

Inflammation of the uterine lining causes endometritis, which can also be recognized by a curve in the graph.

A bright, characteristic feature of the disease - rectal indicators around 37 degrees on the first day of the cycle, and after a slight fall, they again rise. Such deviations from the norm require mandatory treatment to a specialist.

With inflammation of the appendages (adnexitis), BT is consistently high throughout the cycle — 37 degrees or more.

When to see a doctor

In addition to important knowledge of what basal temperature should be before menstruation, a woman needs to fix the duration of each phase.

The length of the second (luteal) phase is normally 12-13 days. As for the indicators before the onset of ovulation, then the time frame is more free. However, in a healthy woman, such fluctuations should be negligible. Moreover, such "minor violations" should be noted only in the first phase.

We list the important signs, after identifying which a woman needs to undergo a complete gynecological examination:

  • After ovulation, the basal temperature rises, but quite a bit - by 0.3 degrees or even less
  • The numbers fixing the changes during the whole cyclic period have approximately the same indicators or the exceeded or reduced values,
  • In the middle of the cycle, there is a very slow rise of values
  • The first phase lasts more than 18 days, and the second - less than 10.

BT and pregnancy

However, indicators that differ from the norm can be evidence of a pleasant and often long-awaited event.

After all, many women are beginning to use this technique to calculate the best time for conception and quickly determine the onset of pregnancy by BT.

What should be the basal temperature after ovulation, if a woman conceived a child?

Sometimes about a week after ovulation, BT sharply or slightly decreases - by 0.2-0.5 degrees. This is the so-called implant recession - the moment when the egg is attached to the wall of the uterus. It does not last long - on the chart the decline is usually only for one day. Then the indicators return to their previous elevated values. Before menstruation, basal temperature stays at 37.1 and higher (and does not decrease, as usual).

During pregnancy, temperature data after the release of the egg for a long time retain high rates: from 37 to 37.5 degrees. If these factors are accompanied by a delay in menstruation, and a tightness or soreness is felt in the chest, then the pregnancy test may be positive.

However, if these signs are joined by discharge of blood from the vagina, you should definitely visit a doctor, as in this case there is a high risk of miscarriage.

In the event that pain and increased body temperature are added to the above symptoms, an urgent need to go to the hospital, as these signs may indicate ectopic pregnancy.

Is the method reliable?

Patients and gynecologists use the rectal temperature values ​​for a long time, despite the fact that new, modern diagnostic methods have already appeared.

Can this research method be considered reliable? Unfortunately not.

Even if you follow all the recommendations for measuring temperature, the indicators may be inaccurate, as many factors influence the temperature regime:

  • Physical exercise,
  • Stress states or psycho-emotional stress
  • Hormonal drugs
  • Infectious diseases,
  • ORVI,
  • Drinking alcohol
  • Sexual contact
  • Short or excessively long night's sleep,
  • Long journeys.

It is impossible to take into account all the factors influencing the change in temperature indicators, therefore it is impossible to consider the measurement of the basal temperature as 100% reliable.

It would be more appropriate to use this technique as an adjunct along with such diagnostic methods as folliculometry or hormone level tests.

Its fluctuations are due to changes in the concentration level of certain hormones in different phases:

  • Menstrual phase. It starts from the first day of bleeding, on average lasts up to five to seven days. It is characterized by a low level of basic female hormones.
  • Follicular phase. It is counted from the first day of menstrual discharge, lasts about twelve days. At this stage, the growth of follicles occurs, with one or more of them, stand out in size and contain a mature egg. This growth provides follicle-stimulating hormone (FSH). In addition, the level of estrogen increases, it is under its influence that egg maturation occurs. The peak of hormone production occurs on the day before ovulation.
  • Ovulatory phase. It starts around the middle of the cycle and lasts about three days. A sharp increase in estrogen levels contributes to a jump in luteinizing hormone (LH) - a precursor of ovulation, while the level of FSH decreases. There is a release of a ripe egg cell from the follicle, and the follicle itself becomes the growth site of the corpus luteum, a temporary progesterone-producing gland.
  • Luteal phase. Its average duration is sixteen days. Characterized by an increase in the level of progesterone - a hormone that supports pregnancy. If the pregnancy in this cycle has not come, then by the end of the phase the activity of the corpus luteum fades, the level of hormones decreases and menstruation begins - the beginning of a new cycle.

As a rule, BT tends to decrease in the follicular phase and increase in values ​​after ovulation. Temperature 37-37,2 ° C. is the norm for the luteal phase, and if the pregnancy has occurred, then high values ​​persist until postpartum menstruation.

If the pregnancy has occurred, and the BTT scores are low, this indicates a shortage of the hormone progesterone and a possible threat of spontaneous abortion.

In the absence of pregnancy, the temperature will gradually decrease, and by the beginning of the new menstrual cycle will be 36.6-36.7 ° C.

Temperature standards a week before menstruation

A week before the month, the average values ​​of BT are in the range of 37-37.5 ° C. At the same time, sometimes, it is possible to fix a short-term insignificant decrease in the index by 0.3 ° C. Such a decrease may indicate implantation of the ovum into the uterine wall. Implantation temperature dropping may be accompanied by minor bleeding.

Temperature standards for 3 days before the critical days

In the absence of pregnancy, the level of BT will gradually decrease, and by the first day of the next period will be 36.6 ° C. If the pregnancy has come, then normally, 3 days before menstruation, its indicators will be in the range of 37-37.5 ° C. There are situations when the temperature level falls, and pregnancy nevertheless has come. Such indicators are characteristic of the state of threatened miscarriage and require immediate treatment to a specialist.

Analysis of the constructed temperature graphs allows to establish possible pathological conditions, for example:

  • The level of BT in the luteal phase of the cycle has decreased, and during the menstrual flow of the new cycle it has settled at 37 ° С. This suggests a possible development of endometritis.
  • High BT drops throughout the whole cycle, the chart has many peaks and lows. This picture indicates estrogen deficiency.
  • A monotone curve that does not contain in the middle of the transition from low to high, may indicate the absence of ovulation. At the same time, BT in the luteal phase does not reach the level of 37 ° С.
  • The absence of a transition from low BT to high, a slight increase in temperature in the luteal phase, may indicate estrogen-progesterone deficiency.

Basal temperature before menstruation 38 ° С

An increase in BT in the luteal phase to 38 ° C is not the norm. When high temperatures do not decrease for a long time, this may indicate inflammation of the organs of the female reproductive system. If they are registered for several cycles, consult an obstetrician-gynecologist for advice.

When measuring BT, it is necessary to adhere to the basic rules and recommendations:

  1. Measurements are taken every day at the same time. The result will not be reliable if some readings are taken in the morning and others in the evening. The most optimal period for measurement is 6-7 o'clock in the morning.
  2. It is best to measure immediately after waking up. You should not make unnecessary movements, so you should prepare in advance a thermometer and a notebook with a pen to record the result.
  3. Temperature measurement carried out in the prone position.
  4. Use the same thermometer. The most safe and easy to use is an electronic measuring device, which is characterized by high accuracy and speed of measurement.
  5. It is necessary to note the actions unusual for the normal state. For example, stress, medication, illness.
  6. Simultaneously with the temperature readings, the nature of the discharge should be recorded.

If the above measurement rules are observed, the BT indicators will most accurately reflect the changes occurring in the woman's body, which will allow to recognize and not to miss the beginning of the development of many pathological conditions.

Plotting basal temperature

On the basis of regular measurements of indicators of BT, you can build a graph. The ordinate axis of which is the value of BT, the abscissa axis is the day of the cycle.

On the graph, dots mark all temperature indicators starting from the first day of the cycle. Then, you need to connect all the points with a consistent line. Ideally, if you draw an imaginary line in the middle, you should get a two-phase graph, the left side of which has lower rates than the right one.

At the same time, according to the state of the curve, the average temperature level at a certain period of the menstrual cycle, as well as the duration of the phases, conclusions can be drawn about:

  • Hormonal insufficiency. Low or excessively high average temperatures may indicate a deficiency of estrogen, progesterone, excessive production of prolactin. Hormonal imbalances may also be indicated by a decrease or increase in the duration of certain phases of the menstrual cycle.
  • Upcoming ovulation. Decrease and then a sharp jump in temperature indices indicate ovulation occurred and favorable days for conception.
  • The onset of pregnancy. In this case, in the second phase, the temperature will have elevated values.
  • The presence of inflammatory processes in the uterus or appendages. Such states are characterized by high rates of BT in the first half of the cycle.
  • The lack of ovulation. The absence of ovulation is indicated by a graph of BT, in which there are insignificant rises and drops in the temperature curve throughout the entire menstrual cycle.

It is worth remembering that the schedule for one menstrual cycle is not informative. For a more accurate picture, it is necessary to construct at least three graphs based on the BT indicators of three consecutive menstrual cycles.

In this case, violations identified on the basis of the schedule, are not a specific diagnosis. If you find any abnormalities should contact a specialist for advice.

Basal temperature values ​​before menstruation

Basal temperature before menstruation: why measure it? First, let's look at the definition of the term. We all know well that the normal temperature in the armpit should be 36.6 ° C. If the body temperature is lower or higher than normal, we immediately feel unwell, and I want to take a hospital. But the basal temperature does not affect us so much. We will not be able to feel even a sharp temperature drop by half a degree.

So, the basal temperature is, roughly speaking, the temperature of our mucous membranes, which characterizes some of the processes occurring inside our body. It is very interesting to observe this as a doctor, but we are not all doctors. Why such information may be needed by a simple person, more precisely, to a woman, since basically information about changes in BT is important to her? The fact is that the basal temperature changes during the period of ovulation, therefore, if there is a question about family planning, then mastering this method is important for a woman who wants to become pregnant.

We measure BT and build a graph

Базальную температуру измерять довольно просто: в этом способе используется обычный термометр. Только измерять температуру надо не в подмышечной впадине, а в прямой кишке, во влагалище или во рту. Измеряя температуру перед месячными, можно узнать, как скоро наступит следующая менструация. И, кстати, если произошла овуляция, в период перед месячными можно это определить.

But I wonder what the basal temperature (BT) before menstruation will be in the absence of pregnancy, with positive ovulation? What characterize the numbers on the thermometer? Let's take a look at the different situations and possible reasons for deviations from the generally accepted norms.

Basal temperature before menstruation 36.9 ° C and there are no jumps in the values ​​in the graph in the second half of the menstrual cycle. This indicates the absence of a mature egg. This cycle was probably anovulatory. But this does not give grounds for a woman to diagnose “infertility”. Since even 20-25-year-old women with a good ovulatory reserve, such cycles can occur 2-3 times a year.

If a basal temperature before menstruation 37.0, 37.1, 37.2 degrees, this may indicate a pregnancy. And, most likely, the way it happened. And if the rise of BT was before the expected monthly, it is possible that there will be no more, at least in the next nine months.

Basal temperature before menstruation 37.3 ° С slightly higher than normal. Perhaps the discharge from the norm is associated with nerve overstrain, inflammatory processes in the body. It is advisable in this situation to consult with your doctor.

Basal temperature before menstruation 37.4 ° С often associated with estrogen deficiency. Get pregnant in a period of elevated basal temperature is unlikely to succeed. But to postpone the trip to the doctor is not worth it. A gynecologist may refer you to an endocrinologist. Perhaps planning a pregnancy will have to wait. It is important to identify the cause of such a high basal temperature.

If you decide to use this method when planning pregnancy to determine the possible reasons for the absence of conception or to determine the day of ovulation, remember that a stable (for at least 3 menstrual cycles) increase in basal temperature before menstruation, as well as its decrease below 36.5 ° C criteria that should not be ignored. If you are trying to get pregnant, then any jumps on the temperature chart that you cannot understand should be explained by your gynecologist.

Features of temperature indicators

If you know what the basal temperature should be before menstruation, and regularly measure it, you can quickly detect deviations in the functions of the reproductive system. Then the woman, without delay, should visit a gynecologist for the diagnosis of pathology.

Changes in basal temperature (or BT for short) depend on the content of hormones in the body. It can be measured in several ways:

  • through the rectum,
  • in the mouth,
  • in the vagina.

Increased basal temperature before menstrual 36.9-37.2 may be kept at one point for 1-2 weeks before their arrival. That is, such an indicator is a fact of the early onset of menstruation. For 1-3 days or when menstruation begins, the temperature changes to the level of 36.6-36.4.

An increase in basal temperature before menstruation to 37-37.2 may indicate that the pregnancy has occurred, which is caused by a change in the hormone content of the woman’s body. The same temperature indicators are observed during ovulation, but, as a rule, after its completion, the mark on the thermometer decreases, which does not occur after conception. Then the elevated temperature can persist until the end of the first trimester of pregnancy.

Not all women are concerned about what the basal temperature before menstruation is the norm, and what is not. Moreover, most of them do not measure it at all, and this is one of the main indicators by which many diseases of the reproductive system can be diagnosed.

Despite generally accepted norms, BT can vary in women in the same period of a cycle, but does not pose a health hazard. It is rather the exception associated with the individual characteristics of the organism.

The temperature can rise up to 37.3 in 1-5 days before the onset of menstruation, when the hormonal level changes. This is the norm, but under the condition that after the arrival of the month the indicator starts to decline, and over the course of 5 days it gradually reaches the value of 36.7-36.4.

In general, the normal indicators of BT throughout the entire cycle fluctuate within 36.3-37.3, and its higher or lower level is a reason for a quick visit to the doctor to identify the cause of the deviations.

Why the basal temperature rises

Increased BT before the onset of critical days can occur for several reasons:

  • pregnancy,
  • dysfunction of the genitourinary system,
  • inflammations that occur in the genitals,
  • phase of the menstrual cycle.

Pregnancy - this is one of the main reasons as a result of which the basal temperature rises. This is due to the fact that in its early stages the female body begins to rebuild, the size and some functions of the genital organs change, and the level of hormones intensively increases. For this reason, during pregnancy, BT can rise or drop slightly, remaining within 37.0-37.3 degrees, depending on the characteristics of the functioning and structure of the female body. It is necessary to start measuring BT in the first trimester of pregnancy, since during this period the formation of the fetus takes place and the hormonal background is rearranged for the favorable development of the baby in the womb

Failure of the genitals can also give a temperature-raising effect. In this situation, the increased rate, as a rule, is accompanied by the poor state of health of the woman, since the disruption of the functioning of the genitals significantly affects health. Before menstruation, the basal temperature can vary from 37.2 to 37.5 degrees, hold 1-1.5 weeks before the start of critical days, and after the onset of menstruation, drop sharply to 36.3.

If a woman has any inflammatory pathologies that affect reproductive function, then it is possible that BT will increase before menstruation. This may occur a week before menstruation, but its increase will be more noticeable 1-3 days before menstruation occurs.

The phase of the menstrual cycle affects the rate of basal temperature.

In its first half, the mark of BT should not rise above 36.7, while in the second norm the temperature is considered to be from 36.8, but not exceeding the value of 37.3 degrees.

Mostly during the day, BT drops, and increases in the evening. The best time to measure is the morning when the woman is still in bed. If you keep a schedule of basal temperature regularly, then within 3-4 months you can see the pattern of changes in indicators. This will further be able to help identify any abnormalities in the menstrual cycle and diagnosis. It is not necessary to monitor BT fluctuations all day, measuring it 3-4 times a day, but daily observations will not be superfluous.

7 rules for measuring BT

The BT schedule is very important, because, based on his testimony, the doctor will be able to draw some conclusions regarding the woman’s health, so you need to know not only what the basal temperature before menstruation is measured for, what should be, but what her deviations from the norm mean, correctly at home to measure it.

To measure BT, there are some rules with which you can correctly perform the procedure, while obtaining a reliable result.

Measure the temperature at the same time. Best to choose the morning. A slight deviation is allowed within 30 minutes. The ideal time to measure no later than 8 am, it is also necessary that sleep before it lasts more than 4 hours.

Measurement of BT can be done in any convenient way: in the mouth, through the large intestine, into the vagina.

It is necessary to use the same thermometer, but if under any circumstances it had to be replaced, then it should be recorded in a separate notebook. In the evening, you should prepare the necessary equipment, in particular, a device for measuring temperature, and put it near the bed, and in the morning, without getting up, proceed to the procedure.

How much a thermometer needs to be kept depends on the method of measurement, but on average not less than 5 minutes.

A special schedule should be maintained, in which all indicators for the day, week, month and beyond will be indicated. It helps to trace the stages when the temperature drops, or increases.

If you follow these simple recommendations, then the measurements will be reliable, and with their help it will be possible to prevent the exacerbation of diseases of the reproductive system or to detect pregnancy.

What may indicate increased or decreased BT

The indicator BT, which is significantly higher or lower than the prescribed value, may indicate violations and interruptions in the functions of the reproductive system. Therefore, many women are interested in what should be the normal basal temperature and what does it mean if the indicators do not coincide with the norm.

Excessively high or low temperature due to certain disruptions in the body and the synthesis of hormones. The main reasons for which changes in BT can be observed are as follows:

  • disruptions in the hormonal background,
  • the onset of menstruation,
  • disorders of the thyroid gland and ovaries.

Disruptions in the hormonal background, as a rule, are due to a lack of estrogen or progesterone in the female body. This may be manifested by an increase in BT due to the lack of hormones necessary for normal functioning of the reproductive system, so the basal temperature before the monthly 37.0 in this case is evidence of violations. Sometimes it can reach 37.5 degrees.

Low BT levels may indicate the end of menstruation or premature termination of pregnancy.

Indicators BT should be recorded in a separate notebook in the form of a graph. On its basis, it is possible to trace obvious deviations in the course of the menstrual cycle. The level of basal temperature should be approximately the same for all women, unless there are individual characteristics and congenital abnormalities in the reproductive system. If there are any deviations in the schedule, the reasons for which are unknown, you need to visit the doctor, since the development of inflammatory processes or diseases in the body or the occurrence of pregnancy is likely.