Level 1: What is basal body temperature? Basal body temperature refers to the body temperature at rest. It is usually measured after waking up in the morning before getting up, eating, drinking and other activities. It can reflect the time when eggs mature and are released during a woman\’s menstrual cycle, and can also help women determine whether they are pregnant. Level 2: How to measure basal body temperature? Measuring basal body temperature requires a high-precision digital thermometer. After waking up in the morning, before getting up, eating, drinking and other activities, measure the body temperature through the mouth or anus and record it. It is recommended to do this at the same time every day