Urinary methylmalonic acid/creatinine ratio defines true tissue cobalamin deficiency.
Norman
E J
EJ
D003404:Creatinine / Q000652:urine*; D006801:Humans; D008764:Methylmalonic Acid / Q000652:urine*; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis*
D008764:Methylmalonic Acid; D003404:Creatinine