Upper GI series
: A series of x-rays of the esophagus, stomach, and small intestine (upper gastrointestinal, or GI, tract) that are taken after the patient drinks a barium solution. (Barium is a white, chalky substance that outlines the

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upper GI series n fluoroscopic and radiographic examination (as for the detection of gastroesophageal reflux, hiatal hernia, or ulcers) of the esophagus, stomach, and duodenum during and following oral ingestion of a solution of barium sulfate called also upper gastrointestinal series

Medical dictionary. 2011.

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