Basal body temperature refers to the body temperature measured when the human body is in a resting state. The measurement method is that in the morning after 6-8 hours of sleep, do not do any activities after waking up, such as getting up, talking, urinating and defecating, drinking water, etc., immediately put the thermometer under the tongue, and obtain the basal body temperature reading about 5 minutes later.
Record the daily measured results on a grid paper and connect them into a curve. For women with normal ovarian function, the body temperature measured after menstruation is below 36.5%. After ovulation, because progesterone secreted by the corpus luteum acts on the thermoregulation center of the brain, the basal body temperature can rise by 0.3 ° C to 0.5 ° C, and maintain it until menstruation comes and then decreases again. This basal body temperature is low before ovulation and high after ovulation, so it is called the biphasic body temperature curve. If the measured body temperature only fluctuates slightly within a month or more, it indicates that the patient lacks progesterone to affect the luteal function, but does not ovulate, so it is called monophasic body temperature curve. Due to its simplicity, non-invasive nature, and cost-effectiveness, this method allows patients to persist in testing for a long time, making it a basic examination for infertile patients.
The following information can be obtained by measuring basal body temperature:
(1) Is there ovulation and when. Ovulation usually occurs on the day before the low-temperature period.
(2) Estimate the date of menstruation.
(3) Diagnose early pregnancy.
When the high-temperature period lasts for 16 to 18 days, especially reaching 20 days, the likelihood of pregnancy is very high.