The U.S. Preventive Services Task Force recommends screening for colorectal cancer using fecal occult blood testing, sigmoidoscopy, or colonoscopy, in adults, beginning at age 50 and continuing until age 75. The risks and benefits of these screening methods vary.
U.S. Preventive Services Task Force. Colorectal Cancer: Screening recommendation summary [Internet]. 2008 Oct [cited 2013 Feb 27]. Available from: http://www.uspreventiveservicestaskforce.org/uspstf08/colocancer/colors.htm