title: Endoscopy in gastrointestinal bleeding. A systematic approach to diagnosis.
mesh_terms: D000792:Angiography; D001466:Barium Sulfate; D003108:Colonic Diseases / Q000175:diagnosis; D004724:Endoscopy; D004945:Esophagoscopy; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006138:Guaiac; D006396:Hematemesis; D008551:Melena; D009780:Occult Blood
chemical_list: D001466:Barium Sulfate; D006138:Guaiac