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A lower gastrointestinal series is a medical procedure used to examine and diagnose problems with the human colon of the large intestine. Radiographs are taken while barium sulfate, a radiocontrast agent, fills the colon via an enema through the rectum.
The term barium enema usually refers to a lower gastrointestinal series, although enteroclysis is often called a small bowel barium enema.
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