Sex hormone six can be checked during menstruation, especially if you want to know the basic function of the ovaries, this time the blood must be collected on the 2nd-4th day of menstruation. Fasting is required for at least 8-9 hours, and the blood should be collected after sitting still for 30 minutes when you arrive at the hospital, preferably before 10:00 a.m., because the prolactin in it is affected by many factors, such as sex, emotional excitement, exercise, and eating. The gonadotropin 6 will undergo different changes at different periods of menstruation, so the reference values of the gonadotropin 6 are different at the early stage of menstruation, the ovulation period and the luteal phase. If menstruation is scanty, irregular or menopausal for a few months, blood can always be collected for testing in this case.