colonoscopy for LGIB

colonoscopy (identifies cause in >70%); early colo (w/in 24 h) unlikely to improve outcome vs. late (24-96 h) (Gastro 2020;158:168). If hematochezia a/w orthostasis, concern for brisk UGIB → exclude UGIB w/ EGD first. Push enteroscopy, anoscopy, capsule endoscopy in combo w/ urgent colo results in dx >95% of cases (GI Endo 2015;81:889).