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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).
Endoscopy (or gastroscopy) An endoscopy, also called a gastroscopy, is the most common test used to diagnose stomach cancer. An endoscope is a thin, flexible tube with a tiny light and video camera at the end, which sends pictures to a screen. The doctor or nurse who does the test is called an endoscopist.