Because irregular menstruation to go to the hospital blood test hormone six need to fasting, and the best in the morning 9-10 o’clock to carry out the test, this time to collect blood from the test index is the most accurate. It is also important to note that it is best to sit still and rest for 20 minutes or more before the blood test. Irregular menstruation can be characterized by irregular menstrual cycles, abnormal uterine bleeding, or prolonged or shortened menstrual periods, all of which are called irregular menstruation. A menstrual cycle usually lasts 21-35 days, with an average of 28 days, and the menstrual period usually lasts 2-8 days, with an average of 4-6 days. If the menstrual cycle is less than 21 days, we call it frequent menstruation, which also belongs to a kind of menstrual irregularity. The volume of menstruation is the total amount of blood lost during a menstrual period. The normal volume of menstruation is 20-60 milliliters, and if it exceeds 80 milliliters, it is called excessive menstruation. When any of these conditions occur, you should go to the hospital to find out the cause of the problem.