title: Urea/creatinine ratio and gastrointestinal haemorrhage.
mesh_terms: D000368:Aged; D003404:Creatinine / Q000097:blood*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014508:Urea / Q000097:blood*
chemical_list: D014508:Urea; D003404:Creatinine