Silver Book Fact
Based on cost-effectiveness consideration, the preferred screening method for colon cancer is a colonoscopy every 10 years after the age of 50.
Lin O, Kozarek R, Schembre D, Ayub K, et al. Screening Colonoscopy in Very Elderly Patients: Prevalence on neoplasia and estimated impact on life expectancy. JAMA. 2006; 295: 2357-2365. http://jama.ama-assn.org/cgi/content/abstract/295/20/2357