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