Colonoscopy Cuts Advanced Cancer Risk by 70 Percent: Study – WebMD

However, the study does not show that colonoscopy or sigmoidoscopy is better than the much easier, far less expensive "fecal occult blood test" (FOBT), which is done at home by swiping a tiny amount of stool onto a card for three days, said Doubeni. "There is strong evidence showing the effectiveness of the [fecal occult blood test] when done annually. There is no reason, based on the knowledge we currently have, that you should switch to a colonoscopy if you’re getting a FOBT every year," said Doubeni.

If simpler tests are effective, why are patients encouraged to undergo a colonoscopy? "Let me just say there are other factors beyond the evidence that are driving the use of colonoscopy in the U.S.," said Doubeni. "No other country uses colonoscopy for screening purposes as much as the United States, although Germany comes close," he noted.

Colonoscopy Cuts Advanced Cancer Risk by 70 Percent: Study – WebMD