ESOPHAGOGASTRODUODENOSCOPY (EGD) – An examination of the lining of the esophagus, stomach, and duodenum with a small camera or flexible endoscope, which is inserted down the throat under sedation. An EGD is also referred to as an upper endoscopy. EGD is performed to diagnose and sometimes treat various upper gastrointestinal diseases.
COLONOSCOPY – Involves the examination of the colon (large intestine) and rectum using a small, flexible camera scope called a colonoscope. Colonoscopy is also referred to as a lower endoscopy.