How and from what the basal temperature changes

Measurement of basal body temperature is necessary to determine the days favorable for conception, to establish early pregnancy, to find out the cause of the delay of menstruation (late ovulation, its absence, pregnancy). The method is based on the hyperthermic (temperature) effect of the hormone progesterone on the thermoregulation center located in the hypothalamus.
The basal temperature under the influence of hormones during the cycle changes as follows. In the first phase of the monthly cycle (follicular), the follicle develops, from which the egg cell then leaves. During this period, the ovaries produce a large amount of estrogen, the basal temperature may be below 37 ° C.
In the middle of the two phases (approximately 12-16 days of the cycle) ovulation occurs. On the eve of the basal temperature drops sharply. During and immediately after ovulation, large amounts of progesterone enter the bloodstream,as a result, the basal temperature rises by 0.4-0.6 ° C. This is a sign of the release of the egg from the follicle.
The second phase, luteal, lasts about 14 days. If conception did not occur, it ends in menstruation. In the luteal phase, the body maintains a balance between lowered estrogen levels and elevated levels of progesterone. During this period, the basal temperature is kept at around 37 ° C and higher. On the eve of menstruation and in the first days of the cycle, it decreases by an average of 0.3 ° C, then the cycle begins anew.
Thus, variations in basal temperature in a healthy woman are the norm. If ups and downs do not occur, this indicates a lack of ovulation and infertility. False positive results in the measurement of basal temperature, namely, its increase in the absence of the corpus luteum, can be observed in chronic and acute infections, as well as in some disorders of the higher CNS.
The length of the 1st phase in normal can vary: shorten or lengthen. However, the length of the 2nd phase should not change, in normal its duration is 14 days (plus, minus 1-2 days). If the duration of the 2nd phase is reduced to 10 days, it is necessary to consult a gynecologist.If the temperature difference between the average values ​​of the 1st and 2nd phases is less than 0.4 ° C, this may indicate hormonal disorders.
A delay in menstruation and an increase in basal temperature over a period lasting longer than 18 days may indicate pregnancy. If menstruation has come, and the basal temperature is still elevated, it is necessary to immediately contact a gynecologist. Most likely the bleeding is a sign of a miscarriage that has begun.

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