A barium enema is an X-ray exam that can detect changes or abnormalities in the large intestine (colon). The procedure is also called a colon X-ray.
An enema is the injection of a liquid into your rectum through a small tube. In this case, the liquid contains a metallic substance (barium) that coats the lining of the colon. Normally, an X-ray produces a poor image of soft tissues, but the barium coating results in a relatively clear silhouette of the colon.
During a barium enema exam, air may be pumped into the colon. The air expands the colon and improves the quality of images. This is called an air-contrast (double-contrast) barium enema.
Before a barium enema, your doctor will instruct you to completely empty your colon.
May 24, 2014
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- Barium enema examination. American Society of Radiologic Technologists. http://www.asrt.org/patients/learn-about-exams. Accessed Jan. 23, 2014.