An upper endoscopy, often referred to as endoscopy, EGD, or esophago-gastro-duodenoscopy, is a procedure that allows a physician to directly examine the upper part of the gastrointestinal (GI) tract, ...

While endoscopy is a procedure in which the gastro-intestinal tract (GI tract), colonoscopy is an examination of the large intestine through a scope placed into the body at the rectum. But it is often ...