title: Clinical application of serum vitamin B12 assay.
mesh_terms: D000748:Anemia, Macrocytic / Q000175:diagnosis*; D000749:Anemia, Megaloblastic / Q000175:diagnosis*; D001681:Biological Assay; D003951:Diagnostic Errors; D006801:Humans; D011865:Radioisotope Dilution Technique; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D014805:Vitamin B 12