Basal body temperature (BBT) measurement method Introduction: Generally, in women, before ovulation, the basal body temperature is low due to estrogen (lower at ovulation), and after ovulation, due to the thermogenic effect of progesterone, the body temperature rises by 0.3°C – 0.5°C, until 1 – 2 days before menstruation. -2 days before menstruation. Therefore, the basal body temperature of an ovulatory cycle is biphasic with low levels in the first half of the cycle and high levels in the second half, while anovulatory cycles are always monophasic with low levels. Basal body temperature is the body temperature measured when the body wakes up after a long sleep (6 – 8 hours) without any activity, also known as resting body temperature. It is commonly used to determine the presence or absence of ovulation, the date of ovulation, luteal function and early pregnancy. Method of measurement: Before going to bed each night, have a thermometer and a form ready by your bedside. In the morning, before waking up and doing any activity (after 6-8 hours of sleep for night shift), take the oral temperature in bed for 5 minutes, and from the first day of menstruation, depict the measured temperature on the basal body temperature sheet every day to form a curve, and indicate the factors that may affect the situation (such as sexual life, fever, insomnia, medication, etc.). Generally, it is necessary to measure more than three consecutive menstrual cycles. Specific methods: 1, equipped with a body temperature table, master the reading method, to ensure accuracy. 2.Every night before going to bed, the mercury column of the thermometer will be thrown to below 35 degrees, placed within reach after waking up. 3.Every morning after waking up, immediately put the thermometer under the tongue for 5 minutes and then take out the reading, and record it on the special form. 4.It is strictly forbidden to get up, urinate, defecate, eat and talk before measuring the temperature. 5, should record the presence of many factors that affect the basal body temperature, such as: colds, insomnia, alcohol consumption, medication, etc. The basal body temperature curve of a normal woman of childbearing age during a menstrual cycle shows a typical biphasic body temperature curve with a low body temperature in the first half and an elevated body temperature in the second half. This temperature curve indicates that the ovaries are ovulating, and the junction of the high and low temperature curves is the ovulation date of the ovaries. In case of cold, fever, diarrhea, insomnia, alcohol consumption, use of electric blanket, etc., the basal body temperature is often easily affected and should be explained at the bottom of the table.