Abdominal x-ray as a scout film for other procedures such as barium enemas. An upper gastrointestinal series is where a contrast medium, usually a radiocontrast agent such as barium sulfate barium salt mixed with water, is ingested or instilled into the gastrointestinal tract, and X-rays are used to create radiographs of the regions of interest. The barium enhances the visibility of the relevant parts of the gastrointestinal tract by coating the inside wall of the tract and appearing white on the film. A lower gastrointestinal series is where radiographs are taken while barium sulfate, a radiocontrast agent, fills the colon via an
Colon cleansing or a "colonic", is a treatment which is used "to wash out the contents of the large bowel by means of copious enemas using water or other medication." During an enema, the water is retained in the colon for approximately 15 minutes. During a colonic, water is introduced into the colon and then it is flushed out and this is repeated until the entire colon is cleared. Colonic irrigation has been described as an "unwise" procedure as it carries the risk of serious harm and has no proven benefit. The consumer advocacy news program Marketplace conducted a consumer trial with