A. The American College of Gastroenterology (ACG) groups colorectal cancer (CRC) screening tests into two groups, cancer prevention and cancer detection tests. Colonoscopy every 10 years, beginning at age 50, is the preferred cancer prevention test. However, colonoscopy is not available in every clinical setting because of financial limitations. Also, not all patients wish to undergo colonoscopy for screening purposes. The ACG recommends alternative CRC prevention testsincluding flexible sigmoidoscopy every 5 –10 years, computed tomography (CT) and colonography every 5 years. Fecal immunochemical test for blood, FIT, is the recommended cancer detection test.