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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).
An upper endoscopy allows a doctor to examine the upper part of the gastrointestinal (GI) tract. The upper part of the gastrointestinal tract is made up of the following parts of the body: Esophagus, which is the muscular tube that connects the throat to the stomach. Stomach.