Only a health care provider can diagnose endometriosis. An obstetrician and gynecologist will likely start with a physical exam, including a pelvic exam. But the only way to confirm for sure that it’s endometriosis is through a keyhole surgical procedure called laparoscopy. That’s when a thin telescope is inserted through a small cut in your belly. It gives doctors a clear view of your pelvic organs so they can see if there’s any endometriosis in that area.