Final answer:
The most reliable way to diagnose endometriosis is through a surgical procedure called laparoscopy. It involves inserting a tiny camera into the abdomen to visually inspect the area where endometrial tissue is suspected.
Step-by-step explanation:
The most reliable way to diagnose endometriosis is through a surgical procedure called laparoscopy. During laparoscopy, a tiny camera is inserted into the abdomen through a small incision, allowing the physician to visually inspect the area where endometrial tissue is suspected. This procedure provides a direct and accurate diagnosis of endometriosis.