title: Urea/creatinine ratios, age, and gastrointestinal bleeding.
authors.forename: E J
authors.initials: EJ
authors.lastname: Dunstan
mesh_terms: D000367:Age Factors; D000368:Aged; D003404:Creatinine / Q000097:blood*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D014508:Urea / Q000097:blood*
chemical_list: D014508:Urea; D003404:Creatinine