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An esophagogastroduodenoscopy (EGD) is an outpatient procedure that is used to examine your esophagus, stomach, and the first part of your small intestine (called the duodenum). An EGD is sometimes called an upper endoscopy because it is used to evaluate the condition of your upper gastrointestinal tract.
A gastroenterologist (a doctor who specializes in treatment of disorders of the gastrointestinal tract) may order specialized tests to look for the cause and extent of the esophagitis. These tests include: Esophagogastroduodenoscopy (EGD): An endoscope is used to directly examine the esophagus, stomach and first part of the intestines. In addition, tissue samples can be obtained (biopsy) to assess the severity of the damage to the esophagus.