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Definition of Upper GI series

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 organs on the x-ray.)

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 8/28/2013

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