Basal temperature of a woman
What is basal temperature?
Basal is called the lowest body temperature, it is achieved during rest. Her fluctuations reflect hormonal changes in the body of a woman. Basal temperature allows you to determine when ovulation occurs and ends, when progesterone begins to be produced, preparing the uterus for pregnancy.
Why measure basal temperature
Basal temperature is measured:
when planning pregnancy to determine the so-called fertile days, the most suitable for conception;
for calculating days of abstinence – as a biological method of contraception;
in the treatment of couples for infertility;
to monitor the development of pregnancy in the first trimester;
with non-occurrence of pregnancy to assess the work of the ovaries;
to identify the inflammatory process in the uterus;
with hormonal disorders to identify them;
to determine the onset of pregnancy with delayed menstruation or with their unusual nature.
How does basal temperature change throughout the cycle
The menstrual cycle is divided into phases. The first – follicular – starts from the end of the period and is pumped when a follicle with an egg (or several follicles) ripens in the ovaries. The follicular phase may be different, but on average it takes half a cycle. During this period, the hormone estrogen is produced in the body of a woman. During ovulation (duration 3 days), the follicle breaks and the egg enters the fallopian tube. In the luteal phase, lasting 12-16 days, a yellow body appears on the site of the bursting follicle, which produces progesterone. During menstruation, an unfertilized egg is expelled from the body.
Depending on the phase of the menstrual cycle, body temperature changes under the influence of hormones. The basal temperature in the follicular phase is 36–36.5 degrees. The day before ovulation, it decreases by 0.2–0.3 degrees, and during ovulation, when a large amount of progesterone is produced in the body, the basal temperature rises by 0.4–0.6 degrees, reaching 36.9–37 ,1. These values are maintained throughout the luteal phase. 1–2 days before menstruation, basal temperature decreases by 0.2–0.3 degrees. But if pregnancy occurs, the basal temperature until the 12-14th week will be above 37 degrees.
Normally, the difference between the basal temperature of the follicular and luteal phases should be at least 0.4 degrees.
Most suitable for conception 3-4 days before ovulation and 12-24 hours after it.
Of course, this method is not always accurate, nevertheless, it can be guided by choosing the time of conception or, conversely, protecting yourself from an unwanted pregnancy.
How to measure basal temperature
Usually, rectal temperature, measured in the rectum, is considered more accurate, although it can also be taken orally, in the mouth, and in the vagina.
In order for the values to be reliable, some rules must be observed.
Measurements should be taken in the morning as soon as you wake up, at the same time, without getting out of bed and without making any sudden movements. Therefore, the thermometer must be prepared in advance and put next to the bed. Before that, you should have at least 6 hours of continuous sleep.
Keep the thermometer for 5-7 minutes.
It is necessary to measure basal temperature in one way (either rectally, or orally, or in the vagina) and use one thermometer.
It is advisable to start measurements from the 6th day after the onset of menstruation.
Data will not be informative or taken into account if a woman got out of bed at night, if she had sex less than 4 hours before the measurements, if she is sick and her general body temperature is elevated, if she took sleeping pills, sedatives, hormones, and drank alcohol.
Measurement data is recorded, and then there is a graph. On the Internet there are special programs for this, which calculate the time of ovulation and draw a schedule.
What results can be obtained
Normally, a typical graph shows a basal temperature increase in the second phase of the cycle by at least 0.4 degrees, the duration of the second phase is 14 days; before ovulation and before menstruation, the temperature drops by 0.2-0.3 degrees.
High basal temperature in the follicular phase indicates a lack of estrogen.
The rise in temperature in the luteal phase is weakly expressed – this graph is characteristic of estrogen-progesterone deficiency.
Low basal temperature in the luteal phase indicates an insufficient amount of the corpus luteum.
If the curve does not change throughout the cycle, then this means that ovulation is absent (anovulatory cycle). Such cycles can be in every woman. However, if this happens for several cycles in a row, this indicates serious violations of the reproductive sphere.