Table 4 Colorectal surveillance protocol in family members at risk for (A)FAP
Type of investigationLower age limitInterval
Classical FAPSigmoidoscopy*10–12 years2 years*
AFAPColonoscopy18–20 years2 years*

  • *Once adenomas are detected annual colonoscopy should be performed until colectomy is planned.

  • (A)FAP, (attenuated) familial adenomatous polyposis.