What is a barium x-ray exam?
A barium x-ray exam is a procedure in which your health care provider uses a barium liquid and x-rays to examine your esophagus, stomach, and small intestine. Barium is a liquid that will show up on an x-ray image. A barium exam of these organs is also called an upper gastrointestinal (GI) barium study, or upper GI series.