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