A small bowel enteroscopy is a test performed to evaluate gastrointestinal bleeding, small bowel tumors, polyps, or other small bowel diseases. During this procedure, the physician uses a thin, flexible tube called an endoscope to examine the lining of your esophagus, stomach, duodenum (first portion of the small bowel) and jejunum (the middle portion of the small bowel). A small bowel enteroscopy may also be used to treat various conditions of the upper gastrointestinal (GI) tract, such as abnormal growths or bleeding.