A medical test more commonly known as a
barium enema. The lower g-i series involves filling the
colon with
barium sulfate (which is opaque to
x-rays) and sometimes air and taking x-rays to search for abnormalities. See
barium enema for more detail.
Tests similar in function to the lower g-i series are colonoscopy and sigmoidoscopy, both of which examine the colon or part of the colon. Contrast with the Upper Gastro-Intestinal Series, where the stomach, duodenum, and small intestine are examined.