title: Colonoscopy and lower GI bleeding.
authors.forename: George F
authors.initials: GF
authors.lastname: Longstreth
mesh_terms: D003108:Colonic Diseases / Q000175:diagnosis*; D003113:Colonoscopy / Q000379:methods*; D003625:Data Collection; D003937:Diagnosis, Differential; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008297:Male; D018570:Risk Assessment; D012307:Risk Factors; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index