Liver function tests can be taken during menstruation. Liver function can be checked at any time during menstruation because liver function does not change with the menstrual cycle. Only the female hormone six needs to be checked during menstruation because sex hormones change with the menstrual cycle. So when you check the sex six, it is to check the menstrual basal six. Other biochemical tests or routine tests can come for examination regardless of the time of menstruation. However, routine urine tests need to be done after menstruation. If you do routine urine tests during menstruation, red blood cells and protein will appear in the urine, which will affect the test results. For the liver function test, you need to fast from water, and it is best to go to the hospital around 8:00 am for the test.