What should I pay attention to when measuring basal body temperature? It is best to apply a mercury column thermometer, preferably the same one not more than one. Dump the thermometer to a low point before going to bed and put it in a place where it is easy to reach in the morning. Regular routine, usually sleep more than 6-8 hours. Do not get up and move around in the morning after waking up, place it under your tongue for 5 minutes. Colds, alcohol, late sleep, and insomnia will affect your temperature, label it yourself. Basal Body Temperature Chart – The easiest and most practical way to know yourself Basal body temperature is the body temperature of the organism in the resting state. Therefore, it needs to be taken when you have slept for more than 6-8 hours, without getting up, eating or drinking, or talking. Every morning when you wake up, the first thing you do is to pick up the flung mercury column thermometer, hold it under your tongue for 5 minutes, and then record the degree on the thermometer. Measuring basal body temperature needs to be done consistently and without interruption for at least one cycle (from the first day of your period to the day before your next period). Connect each point with a line to make a temperature curve of your own. There are a lot of apps like this nowadays, so you can download one and put it in your phone. Generally during the first half of the menstrual cycle, the body temperature is often maintained at a low level, known as the hypothermic phase. After ovulation, the body temperature reaches a high temperature plateau after 2-3 days, known as the hyperthermic phase. The body temperature curve presents these two steps, which we call biphasic body temperature. The average difference between high and low temperatures is 0.3 to 0.5 degrees. When the body temperature drops suddenly on the day before or on the day of menstruation, a new cycle begins. Biphasic body temperature indicates ovulation. Why does the body temperature rise after ovulation? It is because after ovulation, the corpus luteum of the ovary gradually develops and the progesterone secreted by the corpus luteum stimulates the body temperature center, causing the body temperature to rise. Usually the hot phase should last at least 12 days. If it lasts less than 12 days, or if the pyrexia rises very slowly or not very high, it may be a sign of luteal insufficiency. When a woman is pregnant, the ovarian corpus luteum continues to develop and does not shrink, the body temperature will remain high. Usually, if the hyperthermia phase lasts for 16 days and does not come down, we have to consider whether we are pregnant or not. In summary, from a temperature curve, we can know a lot of information, such as whether there is ovulation? When is the ovulation roughly? How is the corpus luteum functioning? Is there a pregnancy? Therefore, it is not an exaggeration to say that the basal body temperature chart is a great tool to understand our body, especially the ovarian function!