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Guide. An upper gastrointestinal (UGI) endoscopy is a procedure that allows your doctor to look at the inside lining of your esophagus, your stomach, and the first part of your small intestine (duodenum).
What is upper gastrointestinal (GI) endoscopy? Upper GI endoscopy is a procedure in which a doctor uses an endoscopeâa long, flexible tube with a cameraâto see the lining of your upper GI tract. A gastroenterologist, surgeon, or other trained health care provider performs the procedure, most often while you receive light sedation.