“…46 Previous studies on diagnostic colonoscopy for nonbleeding symptoms mostly have shown low yields, 47 but, again, very few studies have focused on young patients. 48 In a large, German study, the prevalence of advanced neoplasia was only 2.0% in the subset of patients aged !50 years. 16 However, this study, which included many patients with family histories of CRC, was based on an administrative database that did not contain details on each symptom.…”