title: The discriminatory value of the blood nitrogen:creatinine ratio in localizing gastrointestinal bleeding.
authors.forename: J J
authors.initials: JJ
authors.lastname: O'Brien
mesh_terms: D001806:Blood Urea Nitrogen; D003404:Creatinine / Q000097:blood*; D006471:Gastrointestinal Hemorrhage / Q000097:blood / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D012680:Sensitivity and Specificity
chemical_list: D003404:Creatinine