This is a clinical practice guideline for adults with a family history of nonhereditary colorectal cancer (CRC) or adenoma. The guideline discusses screening for CRC in these individuals, and provides specialized recommendations based on the number of affected relatives, whether or not the relatives have CRC or colorectal adenoma, the severity of the relatives’ disease, as well as how related the relatives are to the patient (i.e. first degree versus second degree relatives).