human
My doctor says I need a colonoscopy. How does it work?
assistant
A colonoscopy is an endoscopic procedure that uses a lighted, flexible tube to examine the interior of the colon. It involves inserting a thin, flexible tube into the rectum and then slowly advancing it through the entire length of the colon. The tube is connected to a video monitor so doctors can view the inside of the colon as they move the tube forward.