Table 1: International guidelines.

Guidelines for screening relatives

(i) British Society of Gastroenterology(i) American College of Gastroenterology(i) Canadian Association of Gastroenterology and the Canadian Digestive Health Foundation
(ii) 2010(ii) 2008(ii) 2010

(i) Colorectal cancer in 1 FDR <50 years(i) Colorectal cancer <60 years or advanced adenoma at any age in 1 FDR(i) Colorectal cancer or adenomatous polyp <60 years in 1 FDR

(i) Once-only colonoscopy at age 55 years(i) Colonoscopy at age 40 or 10 years younger than age of diagnosis of the youngest affected relative, whichever is first(i) Colonoscopy at age 40 or 10 years earlier than the youngest diagnosis of polyp or cancer in the family, whichever comes first
(ii) If normal, no follow up.(ii) Every 5 years(ii) Every 5 years