Blood tests can be performed during menstruation. If you want to have an endocrine hormone test, you must have a blood test on an empty stomach on the second to fifth day of your period. If you want to determine the presence of anemia or infection, you can also have a routine blood test. Similarly, if liver and kidney function tests are performed as part of a health check-up, the same blood tests should be performed on an empty stomach without any effect. No blood is drawn during menstruation, but other tests, such as vaginal ultrasound, cannot be performed, and abdominal ultrasound can be performed. It is also not recommended to see a stomatologist at this time to avoid abnormalities in coagulation, which may cause increased bleeding, and to avoid cross-infection.