Definition of Endoscopy, upperEndoscopy, upper: A procedure that enables the examiner (usually a gastroenterologist) to examine the esophagus, the stomach, and the first portion of small bowel (duodenum) by using a thin, flexible tube that can be looked through or seen through on a TV monitor. Also known as esophagogastroduodenoscopy (EGD). Last Editorial Review: 3/19/2012 Back to MedTerms online medical dictionary A-Z List 
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