They use the air you normally swallow is used as a coctrast agent maybe.
Answered 10/6/2022
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Air contrast upper GI study is also called double contrast upper GI study. Both barium (contrast) and effervescent granules (producing more air in the upper GI tract) are used for better images. You just have to swallow these materials during the study and films and video will be taken in different upper body positions.
Answered 10/6/2022
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