Basal temperature chart during the cycle. Basal temperature during early pregnancy

In a woman's body, there is a regular change in hormonal levels, directly related to the processes menstrual cycle... In a healthy young woman, these changes are clearly repeated from month to month. It is noticed that hormonal effects affects the basal body temperature. Moreover, if you measure the temperature every day at the same time, you can see a clear pattern of changes and reflect them on the graph. In this case, it will be seen on which day of the cycle ovulation occurs, when pregnancy can occur. You can notice whether conception has occurred, recognize pathologies.

Content:

What is basal temperature, the purpose of measuring it

The basal body temperature of 36 ° -37.5 ° is considered normal. In women in different days the menstrual cycle and before menstruation, there are characteristic temperature deviations within these limits, associated with a change in the ratio of estrogen and progesterone. To notice the regularity of these deviations, it is necessary to painstakingly, at the same time every day, measure the basal temperature, and then compare the readings for several cycles.

Since we are talking about deviations in basal temperature in tenths of a degree, it is advisable to exclude the influence of external conditions, therefore it is measured not in the armpit, as with a cold, but constantly in one of 3 places: in the mouth, in the vagina or in the rectum (the most an accurate result is obtained with rectal measurement). It is this temperature that is called basal.

When measuring temperature, the following conditions must be met:

• the same thermometer is used all the time;
• temperature measurements are made in the supine position only in the morning, immediately after sleep, strictly at the same time;
• the duration of sleep in this case should not be less than 3 hours, so that the state of the body is stable, the temperature is not affected by changes in blood circulation during movement and other types of vigorous activity;
• the thermometer must be held for 5-7 minutes, the readings are noted immediately after the measurement;
• if there are possible reasons for deviations from normal performance basal temperature (illness, stress), then it is necessary to make an appropriate note.

It is convenient to display the measured readings in the form of a graph, marking the days of the menstrual cycle on the horizontal axis, and basal temperature on the vertical axis.

Note: Temperature measurements will be effective only if the woman has a regular cycle, it does not matter if there will be 21-24, 27-30 or 32-35 days in it.

What can be learned from the graph of temperature changes

By comparing the graphs of temperature changes over several months (preferably at least 12), a woman will be able to determine on which day of the cycle she ovulates, and therefore, set the time possible conception... For some, this helps to roughly define “ dangerous days", In order to be especially carefully protected before their onset. However, the probability of error is quite high. Even perfectly healthy women can have unexplained disruptions before their period, at least occasionally. Therefore, you should not trust this method 100%.

By the appearance of the resulting curved line, it is determined whether ovulation occurs in each specific cycle, it is concluded whether the ovaries function effectively enough, whether the production of female genital hubbubs is normal.

By the location of temperature points on the eve of menstruation, an assumption is made that fertilization has occurred and the onset of pregnancy is established at the earliest possible date. The doctor will be able to confirm or deny this assumption after palpation of the uterus and ultrasound examination.

Video: What is the value of basal temperature measurement

How basal temperature changes during the cycle (ovulation, before menstruation)

If a woman is healthy, her cycle is regular, then immediately after the end of her period (the phase of maturation of the follicle with the egg), the temperature rises slightly (up to 36.5 ° -36.8 °). Then, in the middle of the cycle (before ovulation), it decreases to 36 ° -36.2 °, reaching a minimum at the moment the follicle ruptures and a mature egg leaves it.

After that, there is a sharp rise in it (the phase of maturation of the corpus luteum and increased production of progesterone in it) to 37 ° -37.5 °, and before menstruation, the basal temperature again gradually decreases until the last day of the cycle to about 36.5 °.

The specific values ​​of the basal temperature for each woman are different, since they are influenced by many factors: the individual characteristics of physiology, climatic conditions, lifestyle and more. But the general pattern remains: a drop in temperature at the time of ovulation, the subsequent a sharp increase for several days and a gradual drop before menstruation.

As an example, the following graph can be presented (cycle duration is 23 days, ovulation occurs on day 9, conception is possible from 5 to 12 days).

Warning: Fertilization is possible only after ovulation, but if sperm has entered the tubes of the uterus before that for several days, it is highly likely that a meeting of sperm and egg will take place. On all other "non-dangerous days" of the cycle in the vagina, due to the action of hormones, such an environment is created that sperm die before reaching the uterine cavity.

The measurement results may deviate if the woman was overworked or ill the day before, and if she did not sleep enough, took any medications (for example, paracetamol for headaches), or drank alcohol. The result will be inaccurate even if sexual intercourse took place within the last 6 hours before basal temperature measurement.

What do deviations of the temperature curve from the norm indicate?

Basal temperature before menstruation, the norm should fall by 0.5 ° -0.7 ° compared to the maximum value at the beginning of the second phase of the cycle. There are several options for deviations:

• the temperature reading before menstruation does not fall;
• it grows before menstruation;
• the temperature spread during the cycle is very insignificant;
• changes in basal temperature are chaotic, it is impossible to catch a pattern.

The reason for such deviations may be the onset of pregnancy, as well as pathologies associated with hormonal imbalance and the functioning of the ovaries.

Basal temperature during pregnancy

After ovulation, in the second half of the cycle, the main role in the ratio of hormones progesterone plays. Its increased production begins at the time of the formation of the corpus luteum at the site of the egg released from the ovary. This is the reason for the sharp spike in temperature on the graph. If the basal temperature before menstruation remains elevated, its value is approximately constant (about 37.0 ° -37.5 °), this may indicate the onset of pregnancy.

For example, on this 28-day cycle chart, you can see that the temperature dropped on day 20 of the cycle. But she immediately began to grow, and during the last days before menstruation she remained at elevated level 37 ° -37.2 °. The drop in temperature by 20-21 days occurred at the time of implantation of the embryo in the uterus.

With the help of the graph, you can only make an assumption about the conception that occurred. The difficulty is that there may be other reasons for an increase in basal temperature before menstruation, for example:

• the occurrence of gynecological inflammatory or infectious diseases, deterioration in general well-being;
• receiving a large dose ultraviolet radiation after a long stay at the beach;
• abuse alcoholic beverages or strong coffee the night before.

However, this tendency to change in temperature indicators can be considered one of the first signs of pregnancy.

Video: How the indicators change during the cycle, the reasons for the deviations

Deviations in temperature readings for pathologies

According to the graph, you can make an assumption about the occurrence pathological conditions causing infertility or miscarriage.

Insufficiency of the second phase of the cycle

There are cases when before the onset of menstruation, the basal temperature not only does not fall, but also rises by 0.1 ° -0.2 °. If at the same time it is also seen that the duration of the phase from ovulation to the next menstruation is less than 10 days, it can be assumed that in this case there is an insufficiency of the luteal phase. This means that there is not enough progesterone to ensure the normal implantation of the embryo in the uterus, the woman has a high probability of miscarriage. In this case, she needs treatment with progesterone-based drugs (dyufastone, for example).

Lack of estrogen and progesterone

A situation is possible in which, as a result of any endocrine disorders or diseases of the ovaries, the body does not have enough female sexual hubbub. The graph will show that ovulation begins, the cycle is two-phase, but the change in indicators, starting from 1 day and ending with the temperature before menstruation, is only 0.2 ° -0.3 °. Such a pathology is often encountered in the treatment of infertility.

If the body lacks estrogen, the graph will be an alternation of chaotic spikes and drops in temperature. At the same time, there is no way to notice when ovulation occurs and whether it happens at all. However, if the graph is of this type, this does not necessarily mean that the woman has this pathology... Temperature jumps could have occurred for another reason: due to stress associated, for example, with moving to new apartment, the occurrence of any disease.

Anovulatory cycles

Cycles without ovulation are the cause of infertility. They can occasionally be observed in every woman. Pathology is their appearance for several months in a row. In this case, the graph will show an almost flat broken line, on which, before the most monthly, the basal temperature practically does not differ from the indicators on other days. There is, as they say, a "one-phase" (anovulatory) cycle.

When to see a doctor

If the temperature value before menstruation rises above 37.5 °, the graph does not show a pronounced drop in the middle of the cycle followed by a sharp surge, the temperature spread throughout the month is no more than 0.3 °, a woman is recommended to visit a gynecologist. You may have to do an ultrasound scan and a blood test for hormones.

(BT) is the body temperature at rest after a rest of at least 3-6 hours (mainly after a night's sleep). It is after rest that the body has its lowest temperature. Practical use its measurement was found in obstetrics and gynecology, since basal temperature can be used to judge the presence and time of ovulation, duration and usefulness (follicular, ovulation, luteal).

general information

For convenience, basal temperature is noted on a graph for at least three menstrual cycles. The basal temperature graph may show the following:

• whether ovulation occurs;
• on what day ovulation occurs (helps to plan a baby or, on the contrary, to prevent pregnancy);
• whether the menstrual cycle has two phases;
• whether the second phase is long enough;
• with a delay in menstruation, it allows you to judge whether pregnancy has occurred;
• whether the hormone of the second phase - progesterone - is produced enough.

information Measurement of the morning rectal temperature allows you to establish the presence of ovulation, as well as the severity and duration of the second phase of the cycle. With a normal menstrual cycle, the basal temperature rises by 0.4-0.8 ° C in the luteal phase.

A stable biphasic basal temperature graph for 3 menstrual cycles indicates a normal stable one.

Measurement rules

1. Basal temperature is measured in the rectum, vagina, in oral cavity however, the first method is the most common.
2. A mercury or electronic thermometer is used for measurement. It is important to use the same thermometer throughout your menstrual cycle.
3. The thermometer is inserted 3-5 cm into the rectum, wait for 5 minutes if a mercury thermometer is used, or until the signal is measured electronically.
4. Basal temperature is measured after at least three hours of rest (sleep), without getting out of bed, before any physical activity. To do this, it is recommended to leave the thermometer close to the bed so that you can get it out without any effort.
5. Basal temperature should be measured every day at the same time.
6. Morning rectal temperature may change after sexual intercourse the day before, against the background of any infectious disease, stress, alcohol intake, lack of sleep, loose stools, etc. All these conditions should be noted on the graph.
7. For a clear and correct picture, BT should be measured for at least 3 months, since even a healthy woman may not ovulate up to 2-3 times during the year. Lack of ovulation for 3 menstrual cycles in a row is a reason to consult a gynecologist.

Basal temperature phases

Basal temperature depends on the work of the ovaries, or rather on the level of sex hormones (estrogen and progesterone). can be divided into three phases:

• follicular;
• ovulation phase;
• luteal.

In the first ( follicular) phase in one of the ovaries under the action of follicle-stimulating hormone, the maturation of follicles occurs (a cell that contains an egg, surrounded by liquid). These cells secrete the hormone estrogen.

information In each menstrual cycle, 5-8 follicles begin to grow at the same time, by the 7th day of the cycle, the largest of them becomes dominant (main), the rest die. By the middle of the cycle, the dominant follicle reaches its maximum size (20-25 mm).

Under the action of follicle-stimulating and luteinizing hormone, the dominant follicle bursts, the egg leaves the ovary into abdominal cavity and then falls into fallopian tube... This process is called ovulation.

At the site of the bursting follicle, a corpus luteum is formed (has yellow on the ovary cut). Its cells under the action of luteinizing hormone begin to produce progesterone... The flowering of the corpus luteum is observed by 19-21 days of the menstrual cycle. If pregnancy occurs, it continues to synthesize progesterone. The corpus luteum functions until the 16th week of pregnancy. If the egg is not fertilized, it regresses, and, as a result, the level of progesterone decreases. The phase from ovulation to the next period is called luteal.

Schedule

All described changes are reflected in basal temperature chart.

• In the follicular phase, under the action of the hormone estrogen, the basal temperature is relatively low (36.4-36.8 ° C).
• The maximum level of estrogen is released during the preovulatory period, therefore, a decrease in temperature is observed 1-2 days before ovulation. After ovulation, the cells of the corpus luteum begin to produce progesterone, which increases the temperature by 0.4-0.8 ° C.
• The maximum level of progesterone is observed 7-9 days after ovulation. If fertilization has not occurred, this is reflected on the graph by a slight drop in basal temperature 3 days before menstruation.

On the plot along the axis Y mark the temperature value, and along the axis X- days of the menstrual cycle (you can mark the days of the month next to it). One menstrual cycle - one schedule. For convenience, you can mark the days of menstruation, sexual intercourse, a general increase in temperature and other conditions right on the graph in special marks. The schedule can be drawn independently on a sheet of paper in a cage, or you can use ready-made printed or computer versions.

With a normal menstrual cycle, on the basal temperature graph, you can determine when ovulation occurred, what is the duration of the follicular and luteal phases.

If pregnancy has occurred, the basal temperature continues to remain relatively high (more than 37.2 ° C). This property can be used in practice when menstruation is delayed and still negative test for pregnancy. With persisting elevated morning rectal temperature, pregnancy may be suspected.

Luteal phase failure

With an inferiority of the corpus luteum or a low concentration of the hormone progesterone, a failure of the second phase of the cycle is observed. This is manifested by a low rise in basal temperature after ovulation, a short (less than 10 days) luteal phase.

With the shortening of the second phase of the cycle after ovulation, the rise in temperature is delayed and shortened. The duration of the second phase is no more than 10 days.

Anovulation (no ovulation)

With anovulation, the basal temperature remains monotonically low throughout the entire cycle. If ovulation has not occurred, then the corpus luteum, which synthesizes progesterone, does not form. The consequence of this is the absence of an increase in basal temperature on the graph.

Conclusion

The method for constructing the basal temperature is visual, simple, cheap, gives an idea of ​​the violation of the hormonal background in a woman, but one cannot draw conclusions based only on its results. There are many errors and exceptions. Therefore, for the final diagnosis and subsequent selection of therapy, it is necessary to use other methods ( ultrasonography with folliculometry, study of hormonal status in different phases of the cycle, ovulation tests).

The basal temperature (BT) method is one of the most fertile days that are considered fertile. Many women, when planning pregnancy, use it with success. It is also interesting in that it can determine the presence of ovulation, or its absence, evaluate the work of the ovaries, suggest possible pregnancy in a few days after ovulation, as well as follow its development for the first 12-14 weeks.

What is basal temperature

Basal temperature is called the temperature, which is measured with a thermometer orally, vaginally, or, most often, rectally (in the rectum) at rest after a night's sleep. During the menstrual cycle, body temperature changes under the influence of certain hormones.

In the first phase of the cycle (follicular), from the end of menstruation to the onset of ovulation, the hormones estrogens dominate in the body. During this period, the maturation of the egg occurs. The average basal temperature of the first phase is in the range of 36 - 36.5C. And its duration depends on the time of maturation of the egg. For some, it can ripen for 10 days, while for others, all 20.

The day before ovulation, the BT value decreases by 0.2-0.3C for one day. And during ovulation itself, when the mature egg comes out of the follicle, and it enters the body a large number of hormone progesterone, BT in one or two days should make a jump of 0.4-0.6 C, reach 37.0-37.2 C and keep within these limits throughout the luteal phase.

During the period of ovulation, the dominant role of hormones changes (estrogens give way to the leading role of progesterone). The most successful period for conception is considered 3-4 days before the onset of ovulation (the time of sperm viability) and 12-24 hours after ovulation. If during this period the egg cell does not merge with the sperm, it dies.

The second, luteal phase, takes place under the influence of the hormone progesterone. It is produced by the corpus luteum, which appears at the site of a burst follicle. The luteal phase lasts from 12 days to 16. BT throughout the entire phase remains above 37.0 C, and if pregnancy has not occurred, a day or two before the onset of menstruation, it decreases by 0.2-0.3 C. During menstruation occurs expulsion from the body of an unfertilized egg along with an unnecessary layer of endometrium already in this cycle.

It is believed that normally the difference between the average of the two phases of the menstrual cycle should be at least 0.4C.

How to measure basal temperature correctly

Basal temperature, according to the rules, is measured in the morning, at the same time (a deviation of 20-30 minutes is allowed), without getting out of bed, avoiding sudden movements. Therefore, it is necessary to prepare a thermometer - shake it off and put it near the bed in the evening.

If you have chosen any method of measuring basal temperature, for example, rectal, you must adhere to it for the entire cycle. The thermometer is kept for 5-7 minutes. It is better to start measuring the temperature from the sixth day after the first day of menstruation.

Data can be written on a piece of paper, and then, connecting the dots, get a graph. Or keep charts on the Internet. For this there are special programs which are convenient to use. The most difficult thing to do is to correctly measure BT and enter the indicators into a spreadsheet. Further, the program itself will calculate the time when ovulation occurred (if it was), draw up a graph, calculate the temperature difference between the two phases.

If you had to get out of bed at night, BT should be measured after 5-6 hours. Otherwise, the indicators will be uninformative and you can ignore them on that day. It is also worth not counting the days when you got sick and your body temperature was increased.

It would be much easier if simple body temperature could be measured rather than basal. The difficulty lies in the fact that the body temperature during the day can change from stress, cold, heat, physical activity etc. Therefore, it is very difficult to catch a period when body temperature would be informative. Therefore, it was decided to measure the basal temperature - after 5-6 hours of sleep at rest.

Basal temperature during pregnancy

As mentioned above, the most favorable period for conception is a few days before and one day after ovulation. If pregnancy occurs, the corpus luteum will produce progesterone up to 12-14 weeks. The basal temperature all this time will stay above 37C, it will not fall before the days of menstruation.

Some women stop measuring BT when they become pregnant. It is not recommended to do this, because BT during this period is very informative and allows you to control pregnancy.

With the onset of pregnancy, BT is kept above 37C, the permissible deviation is 0.1-0.3C. If in the first 12-14 weeks, BT values ​​fall below normal for several days in a row, it is likely that the embryo is at risk. Progesterone deficiency may be present. It is necessary to immediately consult a doctor to take appropriate measures. It will not be superfluous to be examined on an ultrasound machine.

If BT rose above 38C, this does not bode well either. May indicate the presence of infections in the woman's body or the beginning inflammatory processes... On the basis of a one-time decrease or increase in BT, conclusions should not be drawn, because perhaps errors were made when measuring it, or extraneous factors influenced the value - stress, general state organism, etc.

After 12-14 weeks, it is already possible not to measure the basal temperature, because indicators are not informative, because by this time it changes hormonal background pregnant. The mature placenta begins to produce progesterone, and the corpus luteum fades into the background.

Basal temperature chart during pregnancy

If you write down your basal temperature readings on paper, or keep a graph on the Internet, you can pay attention to certain signs that signal that pregnancy has occurred:

- 5-10 days (usually 7) after ovulation, BT decreases by 0.3-0.5C for one day. There is, as they say, implantation retraction. At this time, the embryo first tries to penetrate into the endometrium of the uterus, i.e. find a place for yourself and settle down. Often during this period, women notice minor bleeding within 1-2 days, it is called so - implantation. Sometimes it looks more like a cream or light brown daub;

- the temperature of the second phase tends to above 37C;

- before the alleged critical days, the basal temperature does not fall, but still rises by 0.2-0.3C, on the graph it stands out as the third phase;

- critical days did not come on time, BT continues to hold at a high level for more than 16 days after ovulation. You can do the first test and see the result. It is likely that it will show two stripes.

Don't be discouraged if your schedule doesn't look like a classic pregnant woman. There are schedules by which it is impossible to determine the signs of pregnancy, but it nevertheless has come.

Elevated or depressed basal temperature

The ideal BT schedule should be like a flying bird with outstretched wings. The temperature difference between the two parts should be at least 0.4 C. Sometimes there are deviations from the ideal, which may indicate certain malfunctions in the woman's body.

If the readings of the second phase of the cycle are normal, and the values ​​of the first phase are higher than normal, this signals estrogen deficiency. And if it is much lower than the norm, then on the contrary, about an overabundance of estrogen. What is one of the causes of infertility. Only in the first case, it speaks of a thin endometrium, and in the second, of the existence follicular cysts.

If the indicators of the first phase are normal, and the values ​​of the second phase are below normal, this indicates a lack of progesterone (pregnancy hormone). In this case, pregnancy can occur, but not be held. Therefore, to correct the situation, drugs containing progesterone are prescribed, which should be taken strictly under the supervision of a doctor.

If both phases of the cycle are above or below normal, but the difference between the average temperatures remains at least 0.4C, in this case there are no pathologies and deviations in health. This is how it manifests itself individual feature organism.

Although the BT measurement method is simple and affordable for determining pregnancy or diagnosing health, it should not be the only factor for the diagnosis. Therefore, it must be combined with other methods. For example, to determine ovulation, you can additionally use test strips or ultrasound monitoring, to confirm pregnancy - donate blood for hCG or a test, and to diagnose health abnormalities, take into account laboratory data.

Basal temperature measurement is one of the examination methods female body, in particular, monitoring the functioning of the genital area.

Fertility issues in the monthly cycle

Childbirth is the natural destiny of the female body. So functional features physiological processes are clearly arranged, like everything in nature, which relates to issues of reproduction. The developmental range fits into one menstrual cycle.

Important! The menstrual cycle is the period from the beginning of one period to the beginning of the next. It is at this time that the conditions for conception are created, and they are realized or such a possibility is excluded.

The monthly cycle goes through 2 physiological phases:

1. Follicular.
   At this stage, the follicles enlarge, and the maturation of the egg ends, which prepares for contact with the seminal fluid. The phase starts from the 1st day of menstruation and lasts, on average, half of the cycle, until the release of the egg from the follicle membranes. Fertilization is not possible before ovulation (rupture of the follicular membranes), therefore the phase is not considered predisposing to conception. During this period, the body is saturated with female sex hormones - estrogens, which stimulate the maturation of the egg.
2. Luteal.
   Comes 1 - 2 days before fertilization and ends with the next menstruation or pregnancy. Lasts at least 10 days, usually 12-16, conception is possible in the first 2 days. Increases in organ intake hormonal release corpus luteum - progesterone, which promotes successful development pregnancy.

The duration of each phase is influenced by many factors:

• the resistance of a woman's body to stress;
• susceptibility to infections;
• hormonal supply - this indicator is the most important, because a decrease or excess of the background of hormones in any of the phases reduces the likelihood of conception, and requires correction.

Measurement of basal temperature for several cycles in a row presents a fairly indicative picture. women's health and fertility.

Tracking temperature data

Tracking the correct phase sequence in the cycle allows you to plan a pregnancy with a high probability and implement the plan or avoid unwanted conception.

For a well-functioning genital area of ​​a woman, the following indicators are characteristic:

• after menstruation (more precisely, from 2 to 3 days of the first phase), the basal temperature is set slightly downgraded- 36.2 - 36.5 ° C;
• after the release of the egg (in the middle of the cycle), there is a noticeable increase to 37 ° C or slightly higher (luteal phase);
• at the end of the first phase, 1 - 2 days before ovulation, there is a one-day decline in indicators (0.1 - 0.2 ° C);
• before menstruation and at the beginning of menstruation, the temperature remains at the level of the second phase, and then decreases, a new cycle begins - if during menstruation the numbers do not fall, then most likely conception has occurred, the ovum was planted and pregnancy develops.

Important! At natural method contraception, based on the timing of ovulation, in the first phase of the cycle it is recommended to take additional measures protection, because the maturation of the egg does not always occur at the same time.

• textbook correct graph divides monthly cycle by two approximately equal parts (in duration) - in the first part of the monitored period, the numbers are noticeably lower than in the second;
• increased in initial phase temperature (but not reaching the indicators of the second phase) indicates a possible lack of estrogen, which complicates the maturation of the egg, and a significantly reduced temperature indicates an excess, which also does not contribute to the correct formation of conditions for fertilization;
• low temperature in the second phase demonstrates a lack of progesterone - conception at this time is possible, but fertilization does not always end with pregnancy, but with implantation fetal egg there is a possibility of miscarriage;
• in the absence of a jump in temperature and maintaining it at approximately the same level throughout the entire cycle, they speak of a monophasic course of the period - anovulatory cycle, which is not a pathology if it happens 1 - 2 times a year, and if it appears regularly, it indicates infertility.

Important! Only a doctor can diagnose infertility. For this, the indicators of temperature measurement graphs are not enough - they need additional research and analyzes.

Comparison of temperature indicators of a normal and anovulatory cycle is presented in the table.

Cycle day	Norm	Anovulatory cycle
1	36,9	36,6
2	36,8	36,6
3	36.7	36.7
4	36.5	36.8
5	36.3	36,6
6	36.4	36.5
7	36.4	36.7
8	36.3	36.7
9	36.4	36.6
10	36.5	36.7
11	36.4	36.6
12	36.2	36.5
13	36.4	36.6
14	36.4	36.7
15	36.8	36.7
16	36.9	36.8
17	37.1	36.9
18	37.0	36.8
19	37.1	36.8
20	37.1	36.9
21	36.9	36.8
22	37.0	36.7
23	37.1	36.7
24	37.1	36.8
25	37.0	36.7
26	37.0	36.7
27	37.0	36.6
28	37.0	36.6
	menstruation
	time of expected ovulation

• Normally, 2-4 days before the onset of menstruation, BT begins to decrease and by day 1 of the cycle reaches 37.0-37.1. Then, during normal menstruation, BT continues to decline despite the volume of blood secreted.
• If a woman has a hidden current inflammation of the mucous membrane of the uterus (endometritis) or the uterus itself (endomyometritis), then during menstruation, BT will go UP, sometimes reaching 37.5-37.6 at normal temperature in the armpit.
• The rise in BT in the last 1-2 days of menstruation (if it lasts at least 4-5 days) may indicate inflammation of the tubes or (much less often) the cervix - without affecting the uterus itself.
• A sharp rise in BT for one day during menstruation does not mean anything: inflammation cannot start and end so quickly.

Is it necessary to measure BT during menstruation?

BT measurements can be started both from the 1st day of the menstrual cycle, and on the day of cessation of discharge (a matter of your convenience).

What should be the BT in the first phase?

• Normally, the temperature of the first phase is kept in the range of 36.5-36.8.
• But often the graphs show estrogen deficiency, which is expressed high level BT in phase 1. In such cases, doctors prescribe estrogens, such as Microfollin. But only if these suspicions were confirmed by a hormonal blood test.
• Another unusual phase 1 schedule occurs when there is inflammation of the appendages. After an exacerbation during menstruation, the inflammation may subside, but from time to time give a slight, purely local exacerbation, which is reflected in the basal temperature. BT can rise to 37.0-37.2 for 1-2 days, and then decline again.

What could be the reason for the unexpected temperature rises in the first phase?

Stress, travel, alcohol intake, colds with fever, sex in the evening (and even more so in the morning), measuring BT at an unusual time, going to bed late (for example, went to bed at 3 o'clock, and measured at 6 o'clock), sleepless night, and many other things affect BT. Eliminate "unusual" temperatures by connecting with a dotted line normal readings... Try to set and mark on the schedule possible reason deviations.

What should be the BT in the second phase?

• Normally, the temperature of the second phase rises to 37.2-37.3. But greater importance has a difference in average temperatures (read below).
• Low temperature in the second phase (in relation to the first) may indicate insufficient function of the corpus luteum (progesterone). To support the second phase (and pregnancy), an additional intake of progesterone is prescribed (most often - Utrozhestan or Duphaston) - but only if these suspicions were confirmed by a hormonal blood test.
• Approximately 2-4 days before the onset of menstruation, BT begins to decrease and by the 1st day of the cycle reaches 37.0-37.1.
• If BT rises at the usual time, but then does not drop before menstruation, it stays above 37.0 throughout almost the entire menstruation, and decreases in last days or after the end of menstruation, it is suspicious of a pregnancy interrupted on the days of menstruation.
• If BT in the second phase is kept low (36.9-37.0), and by the time of menstruation it begins to rise and stays above 37.0 during menstruation, then, most likely, we are talking about inflammation of the appendages.

If the temperature of the second phase is not high enough (there is no difference of 0.4 degrees), does this mean that I have a deficiency in the second phase?

Possibly, but not required. BT does not give any information about the usefulness of the corpus luteum function - neither the length of the phase (the temperature can rise even a few days after ovulation), nor the level of progesterone produced by the corpus luteum (the thermometer readings do not allow determining the quantitative level of progesterone in the blood - to assess the level progesterone, you must take a blood test a week after ovulation).

On what day does ovulation occur in relation to the rise in temperature?

Before ovulation, the temperature drops, and after it, it rises. A rise in basal temperature means that ovulation has already occurred.

A drop in temperature at the time of ovulation occurs in only a very small number of women. Since a sharp drop in temperature occurs extremely rarely, this sign cannot be absolutely reliable in determining the ability to conceive, therefore, it is better to use two other signs to determine the approach of ovulation.

If the ovulation schedule is not visible, does this mean that it was not there or I have problems with hormones?

The BT measurement method is very unreliable! In no case should one rely on it when diagnosing any violations or when prescribing hormonal drugs! In cases where there is no obvious second phase on the graphs, it is necessary to conduct ultrasound monitoring, and if there is ovulation by ultrasound, to take a blood test for progesterone a week after ovulation, if the results of both studies are normal - such graphs can be considered a "feature" of the body and stop measuring temperature, if it is not indicative;

Are there more than one ovulation per cycle?

Cases where two (or more) eggs leave the ovaries in one cycle represent a very small percentage of the total ovulation. However, such an exit always occurs within 24 hours. Multiovulation leads to the birth of twins.

If the schedule is perfect, does this mean that you ovulated? Does this mean that you can accurately guess the day of ovulation?

The method does not provide accurate information about the presence of full ovulation even in the presence of biphasic charts (for example, in the case of premature follicle luteinization), as well as accurate information about the timing of the ovulation that occurred (the temperature can rise the next day, and a few days after ovulation - this is within the normal range),

What should be the temperature difference between the first and second phases?

• The difference between the average BT of the second phase and the average BT of the first phase should be at least 0.4-0.5. Except when a small temperature difference is only a feature of the woman's body, and not an indicator of the presence of any violations. This is usually checked additional methods examinations - ultrasound, blood tests for hormones, etc.
• If throughout the entire cycle the temperature on the graph is kept at approximately the same level or the graph looks like a "fence" (low temperatures constantly alternate with high ones), and not biphasic, then this means that in this cycle there was most likely no ovulation - anovulation. To confirm this fact, it is necessary to conduct ultrasound monitoring for several cycles to establish the presence or absence of ovulation. In healthy women, several anovulatory cycles are allowed per year, but if such a picture is observed in all cycles, you need to consult a doctor. In the absence of ovulation, a woman does not have full menstruation - only "menstrual bleeding" (which can be either regular or irregular).

How many days should the climb take?

Normally, the ascent takes no more than 3 days. A more gentle rise reflects a lack of estrogen and weakness, an inferiority of the egg. Fertilization in a cycle, when BT in the first phase is high, and the rise takes more than 3 days is very problematic.

How long are the phases and why is the cycle always different?

The first phase (preceding ovulation) can be very different in duration, as in different women, and the same. Usually, the length of this particular phase of a woman's cycle affects the delay in menstruation - for example, if the maturation of the follicle is slower or does not occur at all. The second phase (after ovulation) is not the same for different women (from 12 to 16 days), but almost constant in the same (plus or minus 1-2 days).

• The lengthening of the first phase of the cycle is atypical, but this does not affect the normalcy of the cycle. A cycle with an extended first phase is normal.
• If the second phase is shorter than 12 days, then this is a sign of failure of the second phase, low progesterone levels.

What BT indicates pregnancy?

• If there is no menstruation, and BT is kept in the second phase for more than 18 days, this indicates a possible pregnancy.
• You can be sure of the onset of pregnancy if the level high temperatures lasts 3 days more than your normal corpus luteum phase. For example, if usually it is 12 days (maximum 13), but once it lasts 16 days, then almost
• If a third level of temperature appears in a normal two-level cycle, then you are almost certainly pregnant. This third temperature level is due to the added progesterone in the pregnant woman's body. Unfortunately, however, not all women have such a three-level schedule.
• If menstruation is scanty or unusual, and BT is kept at an elevated level, pregnancy is possible against the background of the threat of termination.
• If BT rises at the usual time, but then does not go down before menstruation, stays above 37.0 throughout almost the entire menstruation, and decreases in the last days or after the end of menstruation, then this is suspicious of a pregnancy that was interrupted on the days of menstruation.

When does implantation take place and how does BT behave at this time?

The implantation of the ovum occurs on the 6-8th day. It happens that at this time the temperature drops by 1, maximum by 2 days. When you see a decrease in temperature in the middle of the luteinization phase on your graph, it does not mean that you are pregnant. Moreover, such a picture is not necessary during pregnancy.

Do I need to measure BT while taking OC or other hormonal drugs?

You should not measure BT while taking OC - under the influence of the hormones taken, it will not be indicative.