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Graphs of basal temperature during pregnancy before delay with examples. Changes in basal temperature with the onset of pregnancy. Is there a low BBT during normal pregnancy

Menstruation is about to come, there is no delay yet, but the woman experiences strange sensations. What is this? Early manifestations pregnancy or just health problems? How to determine the onset of conception if a pregnancy test at such an early date is ineffective? An indirect sign that a woman managed to get pregnant will be the measurement data of basal temperature.

What is the temperature method based on and how to carry it out correctly

Since attaching gestational sac and for 2 weeks, until the work of the chorion (the embryo of the placenta) is adjusted, in female body increased production of the hormone progesterone, which contributes to the preparation reproductive organs to bearing a baby.

In this moment basal body temperature(measured in the rectum) rises to 37.0-37.3 ° C, less often it is higher. For diagnosing pregnancy early dates even before the delay, it is enough to measure the basal temperature for several days.

In order for the basal temperature indicators to be reliable, the following rules must be observed:

  1. Take measurements at the same time.
  2. Take thermometry in a horizontal position.
  3. Before and during the measurement of temperature indicators, you can not move.

But it should be borne in mind that measuring rectal data to confirm the onset of pregnancy before a delay in menstruation is worth only in the first 2 weeks.

Further indicators no longer have diagnostic importance.

Some women, trying to determine the onset of pregnancy even before the menstrual delay, do not adhere too strictly to the rules for measuring basal temperature and are afraid of temperature variation: from normal to slightly elevated.

In fact, such temperature fluctuations at a short (up to 2 weeks) gestation period can be provoked by the fact that before measuring the basal temperature, the woman performed one of the described actions that provoke a decrease in temperature indicators.

movements

Sudden movements, and even more so getting out of bed, cause a rush of blood to the pelvic organs and greatly affect the thermometer readings. It is best to lie still until the measurement procedures are completed.

Lack of sleep

If the duration of an uninterrupted night's sleep was less than 4 hours, then the measurement of basal temperature will not be accurate. Ladies who had sex in the morning or just got up at night to go to the toilet should not take thermometry - the accuracy of the indicators will be doubtful.

Sex

If a woman had sex less than 12 hours before the rectal readings were taken, the result will be incorrect. To determine pregnancy in the early stages, even before the delay in menstruation using this method, it is advisable to give up sexual activity for several days.

Food

Sometimes toxicosis of pregnant women occurs very early, even before the delay, and then, to combat nausea, many pregnant women prefer to eat a cracker or suck on a lollipop. Eating affects the data of thermometry.

Medication

Some medical preparations(hypotensive, hormonal) should be taken early in the morning, long before meals. If such drugs were taken, then the data of rectal temperature can be both lowered and increased, it depends on the action of the active substance of the drug.

Existing diseases

If there are untreated inflammatory diseases of the intestines or reproductive organs, then regardless of the onset of pregnancy, the basal temperature will always be elevated. If, in the presence of inflammatory diseases, even before the delay, there was a suspicion that conception had occurred, the best way out would be to visit antenatal clinic, where will necessary research and when pregnancy is confirmed, the intake of anti-inflammatory drugs will be adjusted.

When rectal hyperthermia is not a sign of conception

It happens that women measure basal temperature before the delay of menstruation strictly according to the rules and are already preparing to become mothers, but during a medical examination it turns out that conception did not occur, and rectal hyperthermia before the menstrual delay was caused by other reasons. Gynecologists note that the most common causes of " false pregnancy” may be the following.

Late ovulation

2-3 days, when ovulation occurs in the female body and the egg is ready for fertilization, there is a jump in rectal temperature.

Based on this jump, you can calculate the most favorable days for conception. Most women have a stable menstrual cycle, but stress, dietary changes, climate change and other external factors can delay the maturation of the egg, and it may not be ready for fertilization until shortly before the expected date of menstruation.

The temperature jump, combined with the delay, makes the woman suspect that she is pregnant.

This is not a disease, and often the menstrual cycle normalizes when external irritating factors are eliminated.

Here are observed all the symptoms characteristic of pregnant women. positive test for conception, the presence hCG hormone in the blood, but clinical and instrumental studies do not show the presence of a fetus in the uterus. Such a pregnancy cannot be saved, and the embryo is removed surgically.

Ongoing medication

Some medicinal substances that a woman has to take for a long time cause a violation of thermoregulation.

Inflammatory processes

Diseases of the reproductive and urinary systems, as well as inflammatory processes in the rectum often provoke rectal hyperthermia. In women with inflammatory diseases of the pelvic organs, the temperature method will be unreliable: it may indicate both the onset of fertilization and the exacerbation of inflammatory processes. If there is no need for urgent confirmation of the fact of conception, then it is advisable to wait 7-10 days and take a pregnancy test.

Hormonal disorders

Some hormones, especially those produced by the ovaries, can cause hyperthermia in the lower intestine. Most common cause The temperature increase is caused by abnormally high production of the hormone progesterone, which is normally produced in large quantities only in the first 2 weeks after the fertilized egg is attached to the uterine wall.

The main purpose of progesterone is to prepare the female reproductive system for gestation and childbearing before a full-fledged chorion develops in the fetal egg and blood exchange with the mother's body is established.

Women who dream of pregnancy or, conversely, who are afraid of an unplanned conception, should not rely only on temperature measurements, because many factors affect their performance. But still, if there is prolonged basal hyperthermia and menstruation has not come on time, you should take a pregnancy test and consult a doctor, regardless of the result. Even if it was not possible to get pregnant, then timely treated diseases female organs increase a woman's chances of becoming a mother in the near future.

If you are planning to get pregnant soon, then it makes sense to follow the basal temperature chart. So you can reliably track the onset of ovulation and find out about pregnancy even before the delay of menstruation. More on this in the article below, which also provides examples. basal charts during pregnancy.

The human body is a very complex system. It constantly undergoes cyclical changes and processes beyond our control. This is especially true of the female reproductive system. Nevertheless, it is possible and necessary to track some processes, in particular the basal temperature. Such information will not only help you choose the best day to conceive a child, but also monitor the condition of the fetus throughout your pregnancy.

Basal body temperature is body temperature measured in the rectum. oral cavity or in the vagina. On temperature indicator, when measured, the hormonal component in the woman's body affects. The higher the level of progesterone in the blood, the higher the basal body temperature.

It is worth noting that basal temperature should be measured only in a state of calm, best after a night's sleep, which lasted at least 7 hours. This is due to the fact that during the day the temperature is constantly changing depending on the activity of the woman, and in the morning, when the body wakes up from sleep, BT will be the most constant.
The effectiveness of the method is accurate only if the basal temperature is constantly monitored. Regular measurements should be carried out for at least three months, in compliance with all the rules, until the planned conception of the child.

How to measure basal temperature

In order for the basal temperature indicators to be most accurate, when measuring it, you must follow the following rules:

  • basal body temperature should be measured in the mouth, vagina, or rectum. The last option is considered the most informative. It should be noted that it is necessary to measure BT during the study period in the same place, otherwise the schedule will be considered inaccurate;
  • in order to avoid instrumental error, it is necessary to use the same thermometer. It can be mercury or electronic - your choice;
  • basal temperature should be measured in the morning, at the same time every day;
  • it is best to measure basal temperature without getting out of bed, try not to even sit down before the procedure, as the body must be in a state of complete rest;
  • the duration of the measurement should be 5-7 minutes or until the sound signal, in the case of using an electronic thermometer;
  • you need to start keeping a graph of basal temperature from the first day of the cycle and not interrupt measurements even during menstruation.
  • measurements were made in different time days;
  • the body was not at rest;
  • a woman has been ill with viral diseases (ARVI) with fever;
  • while maintaining the schedule, the woman took medications, in particular hormonal ones;
  • during the cycle, the woman was very active and slept little (there were long trips or air travel);
  • on the eve of the measurement, a large amount of alcohol was drunk.

Basal temperature chart during a normal menstrual cycle

As mentioned above, it is necessary to measure basal temperature starting from the first day of the cycle. So, in the first phase of the menstrual cycle with correct work reproductive system of a woman BT should be equal to 36.4-36.7 degrees.

By the middle of the cycle, this figure drops to approximately 36.2 degrees. Then it rises sharply to 37 degrees and above. This mark on the thermometer indicates the appearance of ovulation and the most auspicious days for conception.

After ovulation is completed, the temperature drops again, to about 36.7 degrees.

Basal temperature chart for anovulatory cycle

The anovulatory cycle of menstruation is a period when ovulation and maturation are not observed in the female body. corpus luteum. At the same time, the regularity of menstruation is maintained.

It is worth noting that the anovulatory menstrual cycle is normal and does not indicate any changes in a woman's reproductive health. It happens once or twice a year.

The graph of basal temperature during the anovulatory menstrual cycle fluctuates at around 36.4-36.7 degrees and does not increase in the second phase.

Chart of basal temperature during pregnancy before delay

Thanks to the indicators of basal temperature, you can find out about the onset of pregnancy even before the delay of menstruation. The fact is that the hormone progesterone is responsible for increasing or decreasing BBT. During ovulation, its content in the blood rises significantly, and the temperature internal organs increases. So, if conception has occurred, then its quantity does not decrease, which means that the temperature is also preserved. If you notice that BBT has not decreased after the expected end of ovulation and remains at around 37 degrees and above, then you can most likely be congratulated on successful conception fetus.

The BT schedule during pregnancy before a delay is not a 100% accurate indicator, so it is also recommended to make a test strip.

Basal chart during pregnancy, photo:

Chart of basal temperature during early pregnancy

If you are convinced that pregnancy has occurred, then you should not stop keeping a schedule. Indeed, with the help of information about the temperature during pregnancy, you can control the condition of the fetus and the possibility of inflammatory processes.
It is especially important to control the BT schedule during early pregnancy if:

  • you have had miscarriages in the past;
  • previous pregnancy ended in fetal fading;
  • you are in treatment;
  • There have been cases of ectopic pregnancy.

In the first trimester, the normal basal temperature should be kept at around 37-37.2 degrees. If it increases, especially exceeds the figure of 37.5 degrees, then this serious reason see a doctor.

Examples of basal temperature charts during pregnancy.

Temperature chart during pregnancy

If your pregnancy is proceeding normally, then after 20 weeks, the basal temperature will decrease, and marks of 36.8-36.9 degrees should appear on the chart. If you see a slight increase in BBT in the second trimester (by 0.1-0.2 degrees) - do not be alarmed, perhaps this happened due to heavy loads on the body or your activity the day before.

Just like in the second trimester, in the third, the basal temperature is slightly lower than that which was immediately after conception and is kept at around 36.9 degrees.

The reason for the experience may be an increase in basal temperature in the second and third trimester above 37.3 degrees. This may indicate:

  • inflammatory processes, in particular the pelvic organs;
  • exacerbation of infectious diseases;
  • placental abruption.

It is worth noting that it is extremely important to track the BT schedule during pregnancy by weeks until the 18th week. After the 20th week of pregnancy, this procedure is practically useless, since both you and the baby will be under constant medical supervision. Compared to regular check-ups with a doctor, the BT schedule will generally not be informative.

Graph of basal temperature during pregnancy. Video

Correctly reading the chart of basal temperature during pregnancy, even before the delay of menstruation future mom can track it down. You also need to know what factors can distort the result, so as not to take them for deviations in the development of pregnancy.

Characteristic indicators at different stages of the cycle

Basal temperature, as one of the methods for determining a day favorable for conception, is currently widely used, although the measurement does not give a 100% guarantee and has a sufficient number of shortcomings. When planning a pregnancy, you need to start preparing in advance and, for comparison, take readings of at least 3-4 cycles, building a curve connecting daily temperature points.

Before talking about building a digital axis, let's figure out what normal values it should display:

End of the menstrual cycle

  • At the end menstrual bleeding in the first period of the cyclic process, the thermometer shows approximately 36.2-36.5°C. It is at such marks on the thermometer that the maturation of the egg occurs with the participation of estrogen, which controls this process.

Temperature before and after ovulation

  • On the eve of ovulation, there is a slight decrease in temperature by a few tenths of a degree, and then an increase to 37 ° C and above. This indicates the release of the cell and its movement to meet the sperm in the fallopian tube.

An example of a basal temperature chart during pregnancy before a delay

  • After the fusion of the germ cells, the graph of the basal temperature during pregnancy before the delay (photo examples confirm this), stably shows slight fluctuations between 37 and 37.5 ° C throughout the pregnancy.

The schedule of basal temperature during pregnancy until the delay is kept at a certain temperature of 37.5 ° C until the end of pregnancy.

  • If fertilization has not occurred, a few days before menstruation, a gradual decrease in temperature begins and from the first critical day it becomes 36.8 ° C and lower.

Diagnosis of pregnancy according to the schedule

Elevated temperature marks on the curve are the first indirect sign completed conception, then it will be confirmed by nausea, pain in the mammary glands, mood changes, taste preferences etc., and the final line will be put by two identical strips on the test.

Graph of basal temperature during pregnancy before delay - 36.9 ° C

The very moment of fertilization passes unnoticed for the woman, but the implantation of the embryo to the endometrium can be fixed. In this case, the graph of basal temperature during pregnancy before the delay is 36.9 ° C or slightly less on days 5-7 after ovulation. Approximately such a period of time is necessary for the fetal egg to reach the uterus and begin to penetrate into its wall.

Before ovulation, the graph shows a slight decrease in temperature, and then an increase to 37 ° C and beyond.

At this point, you may feel slight drawing pains lower abdomen, and present weak bloody issues from the vagina, as a symptom of fetal attachment. The decrease will be visible for only a day, and then the curve will return to the values ​​that were before the sinking and will no longer deviate.

Signs that distort indicators

We have reviewed normal flow early pregnancy and its inherent adequate values. But sometimes the schedule of basal temperature during pregnancy before the delay, examples have deviations, both upward and downward temperature values. They are caused by certain causes associated with the impact of internal and external factors on the woman's body.

When the shift in indicators happens once, it can be attributed to errors in temperature measurement that occurred due to a completely understandable reason:

  • Insomnia;
  • Short-term sleep, less than 6 hours;
  • Cold;
  • Sexual intercourse 3-4 hours before measurement;
  • Excessive physical activity the day before;
  • Stress.

If there was a sleepless night, colds, stress or exercise, this should be noted in the basal temperature chart during pregnancy in the form of notes so that there is an explanation for the change in temperature.

Dangerous sinking in the basal temperature chart during pregnancy

Ectopic pregnancy

If an increase of 37.5-38 ° C is observed and lasts for several days, an inflammatory process in the female reproductive system can be suspected. It could be infection, and possibly ectopic pregnancy. Attachment of the fertilized egg wrong place may cause peculiar reaction with temperature jumps up and down, and the curve turns out to be somewhat irregular with atypical drops.

Missed pregnancy or miscarriage

Decreasing rates below 36.9°C with confidence in conception is also a cause for concern. In this case, a frozen pregnancy or a threatened miscarriage is suspected. This state of temperature values ​​\u200b\u200bis explained by a decrease in the level of progesterone, which occurs due to the death of the fetus. It is no longer necessary to support the development of the embryo, the corpus luteum gradually reduces its production, the hormone content in the blood drops. He is no longer able to maintain elevated basal temperature numbers, and it drops.

If a threatened miscarriage is suspected, the temperature will be below 36.9 ° C on the chart during pregnancy until the delay.

Chart of basal temperature during pregnancy before delay (video)

In this video, an obstetrician-gynecologist talks about how to correctly measure basal temperature during pregnancy before a delay.

To make sure that you are correctly scheduling your basal temperature during pregnancy before a delay, video materials and examples of girls on the forums will help get rid of doubts about the sequence of actions and deal with temperature values.

When compiling the temperature curve, one should not forget that for each organism only its inherent values ​​\u200b\u200bare characteristic, therefore it is not the numbers themselves that are important, but rather the difference between the first and second phases of the cycle, which should be at least 0.4 ° C.

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 work 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 phases 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 do accurate forecasts 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 activity, food intake, stress, naturally, is reflected in the indicators of 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, basal temperature is measured for five minutes, electronic thermometer it 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 does not accurate results. With the oral method of measuring basal temperature, you put the thermometer under the tongue and closed mouth measure 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 each extra hour sleep raises your basal body 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 are using mercury thermometer then shake it off before going 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.

    For diseases accompanied by elevated temperature body, your basal temperature will be uninformative and you can stop measuring for the duration of your 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 number alcohol 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: common disease, including fever, diarrhea, intercourse in the evening (and even more so in the morning), drinking alcohol the day before, measuring BBT at an unusual time, late going to bed (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 is very helpful for both the woman and her doctor to understand possible reasons 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 level 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 indicators of basal temperature in the first phase, relative to the second, are high, then this may indicate a small amount of estrogen in the body and requires correction medicines 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 low level progesterone and drugs for correction are also prescribed here 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.

by the most optimum time for conception, the day of ovulation and 2 days before it are considered.

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 to it, the length of the first phase can vary greatly, and these variations are individual norm. At the same time healthy woman in different cycles should not be observed 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 level progesterone 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 graphs are repeated from cycle to cycle, then this may indicate hormonal disruptions which are the cause of 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 the 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 graphs with 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 occurs during pregnancy, the formation of a cyst of the corpus luteum of the ovary, as well as in acute inflammatory process 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 (clostilbegit) 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 enough high temperature in the second phase, with characteristic "steps" (the temperature rises 2 times) and a slight depression. If temperature graph during stimulation, on the contrary, it is disturbed 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 idiosyncrasy organism. 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
    graphics with high temperature in the second phase of the cycle for more than 18 days, without the onset of menstruation and negative test for pregnancy
    unexplained bleeding or heavy discharge in the middle of a 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 various 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 appear small discharge that pass 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 secretions. 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 a level middle line 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 changes 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.

Such early signs pregnancy, like nausea, chest tightness, frequent urination, indigestion, or just the feeling of pregnancy 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.

Measurement of basal temperature is one of the main methods of tracking fertility, recognized world organization Health (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 protect against unwanted pregnancy, you need to consider that not only the days of ovulation according to the basal temperature chart 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.

The simplest and affordable way determine the onset of pregnancy at an early stage is associated with the measurement basal body temperature. Those women who are looking forward to the appearance of the baby are probably familiar with this method.

He appeared at the same time calendar method protection, and usually successfully complements it.

In this article, we will talk in detail about the diagnosis of pregnancy. in the early stages by using this method, interpretation of indicators and their norm for different periods.

Basal body temperature is internal temperature human body. It is measured with a thermometer in the mouth, female genital organs or in the anus. Measurement is supposed to be done in the early morning, as soon as the woman woke up. In this case, a thermometer is placed by the bed so that it is easy to reach it.

For cycle control and pregnancy planning, its timely determination, it is necessary to measure the temperature daily, from the first day of menstruation, and record the result to schedule. The most informative is to measure the temperature through the rectum. For this purpose, a conventional mercury thermometer is optimal, as it gives the most accurate results.

In the early morning, after waking up, while the body is in a relaxed state after sleep, it is necessary to insert a thermometer and wait 5-7 minutes. The result is recorded in a notebook for scheduling, or saved in a mobile application.

The norm of indicators in different periods

On the days of menstruation normal is the temperature 36.7 - 36.9 degrees. By the time of ovulation, it begins to rise, reaching its peak - 37.2-37.4 degrees. Temperature after ovulation should start to go down- if conception did not occur. This usually happens 7-8 days before the expected date of menstruation. On the days before menstruation, it drops to 36.8 -36.9 degrees. If conception has occurred, the temperature continues to remain at the level of 37.1-37.4 degrees.

Fever is typical for the first trimester of pregnancy. After 19 weeks she starts gradually decline, rising again by the third trimester - this is a harbinger of an early birth.

Immediately after conception has occurred, the basal temperature rises by several tenths of a degree, and continues to stay at this level, which makes it possible to identify pregnancy. If the thermometer consistently shows 37.2 degrees before menstruation, you can be congratulated. We should expect an addition to the family soon.

Basal temperature before delay

As mentioned above, the method of measuring basal temperature can allow a woman to plan conception and determine pregnancy.

If you are keeping a temperature chart, then pay attention to the following points:

  • after ovulation, for one or two days, the temperature dropped to 36.9-37 degrees;
  • after this jump, the temperature rose again, reaching 37.1.-37.3 degrees.

This factor indicates completed conception. Further, the fertilized egg is attached to the wall of the uterus, and the body begins to produce progesterone, which affects the increase in body temperature. In the early stages of pregnancy, the temperature is kept within 37.1.-37.3 degrees, not subsiding before the onset of the expected menstruation.

Hold temperature

If you have a delay in menstruation, but you have not yet tested with pharmacy strip tests, you can use the diagnostic method by measuring basal temperature.

If the temperature is within 37.1 - 37.3 degrees You are most likely pregnant. Only the result can be affected colds, latent infections, or physical activity before testing.

In the evening, body temperature is often elevated - this is due to physical activity during the day. If you are going to take a temperature measurement, remember that you must rest for at least 3 hours before taking it to get correct result. If you already know for sure that you are pregnant, the temperature can be measured at any time of the day, as this will allow you to notice any deviations in time and take action.

In the evening, the temperature can be from 37.2 to 37.6 degrees during pregnancy.

Basal temperature at 20 weeks of gestation

Basal temperature is highest during the period of active production of progesterone in the body. This period lasts during the first trimester, then, by 19-20 weeks, indicators are declining. Further temperature measurements, as a rule, are not carried out, because the method ceases to be informative.

The optimal performance for a period of 20 weeks is 36.7 - 36.9 degrees.

“I have a temperature…” - what does it mean?

Here we have compiled a decryption standard indicators, which will help you find out if there is a pregnancy, or wait for the imminent arrival of menstruation.

Temperature 36.9

  • During pregnancy - the threat of miscarriage, miscarriage, a period of more than 19 weeks.
  • Before the delay - menstruation should come soon, there is no pregnancy.

Temperature 37.0

This temperature before delay may indicate early onset of menstruation(depending on when you took the measurement), mild inflammation.

If the temperature began to rise slightly, the attachment of the embryo took place quite recently. During pregnancy, it indicates a lack of progesterone and a threat of miscarriage.

Temperature 37.1

Before the delay - a high probability that there was a conception. It should rise a little within a week. If the temperature has dropped - the imminent arrival of menstruation, spontaneous abortion. If pregnancy is confirmed - the norm, a slight lack of progesterone is possible.

Chart in early pregnancy by week

After the 18th week of pregnancy, the temperature decreases, and its indicators are in the range 36.9 - 36.6 degrees.

Now you know what to focus on when measuring and maintaining a graph. Tip - if you notice, already being pregnant, sharp drop in temperature or its jump - see a doctor as soon as possible to avoid the threat of interruption.