What precautions should I take when using endometrial biopsy?
If the endometrial biopsy is being done to investigate why a woman is unable to get pregnant, the test must be performed at a specific time during the menstrual cycle. Since the test evaluates whether the endometrium is developed adequately to support implantation and growth of a fertilized egg, it is critical to perform the test approximately three days before the expected menstrual period. Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.