title: The clinical significance of the serum vitamin B12 assay.
mesh_terms: D000749:Anemia, Megaloblastic / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D014805:Vitamin B 12 / Q000097:blood*; D014806:Vitamin B 12 Deficiency / Q000097:blood
chemical_list: D014805:Vitamin B 12