Vaginal invasive tests are usually not recommended without a clean period; ultrasound, CT, MRI, and blood tests can be done. Menstruation refers to the regular bleeding from the uterine lining that accompanies the cyclical changes of the ovaries. Due to the decrease of sex hormones in the body before menstruation, it affects the systemic system and certain reactions occur. During menstruation, a woman’s immunity is lowered, her hemoglobin is reduced, her blood is hypocoagulated, and her pelvis is congested. Therefore, if you do some invasive examinations or surgeries, it will aggravate pelvic congestion and infection, and the wound will not be easy to heal. Moreover, gynecological examination during menstruation can easily cause reverse flow of menstrual blood, forming endometriosis. It is recommended that women try not to undergo gynecological examinations during menstruation, and consult a medical professional in the hospital if they have any discomfort.