Ovarian function tests are important for gynecological diseases such as irregular menstruation, infertility and amenorrhea. Usually, ovarian function tests include basal body temperature measurement, hormone tests, ultrasound, etc. The functions of ovaries are to produce eggs, discharge eggs and secrete hormones. This is the most basic and simple way to determine whether the ovaries are capable of ovulation. 2. Direct venous blood sampling to check female endocrine hormone levels. For endocrine examination of the basic function of the ovaries, the best time to collect blood is on the 2nd-5th day of menstruation, when the hormone test results of women can assess the basic function of the ovaries. 3. For women with normal menstrual cycle, the best time to see if there is ovulation is on the 7th-20th day of menstruation, the results of which can indicate whether the ovarian ovulation function is normal. 4. Ultrasound can also be done to monitor the development of the follicles. Generally, for a 30-day menstrual cycle, ultrasound is done from the 10th day of menstruation until the end of monitoring the ovaries with mature follicles.