WHAT ARE COLONOSCOPIES? Colonoscopies are viewed as the "gold standard" for catching colorectal cancer before it has a chance to take root and spread. Gastroenterologists recommend that men and women over the age of 50, without a risk of colon cancer, get a colonoscopy every ten years, while those at high risk should receive one earlier and more frequently. In colonoscopies, physicians visually examine the lining of the colon and rectum. Upper endoscopies are used to examine the esophagus, stomach and the upper part of the small intestine (the duodenum). The colonoscope is a thin flexible instrument measuring between 48 inches to 72 inches long. It has a small video camera attached to the end so it can record images of the large intestine. The "scope" is passed through the rectum and into the colon to directly examine the lining of the lower digestive tract -- a full five feet of twists and turns.
