Women can take blood for medical checkup during menstruation because the items of blood test are blood routine, coagulation, liver and kidney function, or hepatitis B, syphilis and AIDS, and these tests will not be affected by the discharge of menstrual blood. At the same time, the amount of blood used for blood sampling is relatively small, mostly within 10ml, so there is no need to worry about blood sampling during menstruation, which may lead to anemia in women. Moreover, during menstruation, fasting blood can be drawn specifically to check the sex hormone six items, so as to determine the basic function of the ovarian endocrine. However, during menstruation, gynecological checkups, such as cervical TCT and HPV, as well as routine leukorrhea checkups, cannot be done.