In order to make the results of endocrine tests more accurate and informative, it is very important to choose the time of the blood test. In the past, many people thought that the test could be done at any time, but in fact, the best time is on the 3rd day of the menstrual cycle. Why is it necessary to have the test at this time? In fact, the reason is very simple, because the test data is more informative and the disease condition can be determined based on the results. As we know, there are four types of menstrual cycles in women: follicular phase, ovulation phase, luteal phase, and menopause, and the normal values of these types are different and vary greatly, so if you can’t determine which of the four phases it is, the results of the test can’t be accurately judged. If you bring in an endocrine test sheet, without specifying the specific time of the menstrual cycle, it is difficult for even the most skilled doctors to determine whether it is normal or not. In clinical practice, there are many consultants who often make such low-level mistakes that make the test results lose their diagnostic value. For example, if the test is performed on the 10th day of the menstrual cycle, it is difficult to determine whether it is the follicular phase or the ovulation phase. If the person’s menstrual cycle is short, only 24 or 24 days, her 10th day of menstruation is ovulation; if her menstrual cycle is 30 days, it is not ovulation. Obviously, a test result on day 10 of the menstrual cycle will not accurately determine whether the endocrine test result is normal or not. Assuming that the patient is amenorrheic, the test can be done directly because there is no change in the menstrual cycle and the hormone level is relatively constant, then the blood can be drawn when there is no menstruation and the test result at that time, for women of reproductive age, is inferred according to the luteal phase. From the point of view of examination, the best time for the sex hormone six test should be on the 3rd day of menstruation.