Luteal function check has the following methods: 1, measuring the basal body temperature: the night before the thermometer at the bedside ready, sleep to at least 6 hours of natural wakefulness, immediately after waking up the thermometer into the tongue, measuring 5 minutes, and then the temperature recorded, is to measure the basal body temperature, at least to measure a menstrual cycle, that is, from this period to the next menstruation to come, if the basal body temperature is If the basal body temperature is biphasic, that is, it rises when ovulation occurs and then falls before the onset of menstruation, this is called a biphasic basal body temperature. If the basal body temperature rises after ovulation, if it is less than 0.3℃ and the duration of high temperature phase is <11 days, it is luteinizing insufficiency. 2. Blood check: progesterone will be produced by the corpus luteum only after ovulation, but avoid checking progesterone at 2-4 days of menstruation which leads to low value, and progesterone reaches its peak only one week after ovulation, so the best time to measure progesterone is one week after ovulation. If the value is ≥15ng/ml or <10ng/ml then it may be luteal insufficiency, and if it is <5ng/ml then it may be the absence of ovulation.3. Diagnostic scraping, which is invasive, is rarely used in clinical practice.