(BARE-ee-um EN-uh-ma) A series of x-rays of the colon and rectum. The x-rays are taken after a liquid with a dye called barium is inserted into the rectum, followed by an injection of air. The barium outlines the intestines on the x-rays, allowing many abnormal growths to be visible. Also known as a barium contrast enema or lower GI series.

see Air contrast barium enema.

This test is used to obtain an x-ray of the colon and rectum. It consists of a white, chalky substance given to patients prior to the x-ray. The barium outlines the colon and rectum on the x-rays to help the doctor see tumors or other abnormal tissue. The doctor may also expand the colon by gently pumping air during the test to look for small tumors.