title: Determination of serum vitamin B12 by an isotopic method.
mesh_terms: D000293:Adolescent; D000328:Adult; D003036:Cobalt Isotopes; D005260:Female; D006402:Hematologic Diseases / Q000097:blood*; D006801:Humans; D007437:Intrinsic Factor; D007938:Leukemia / Q000097:blood*; D008297:Male; D008875:Middle Aged; D011865:Radioisotope Dilution Technique; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D003036:Cobalt Isotopes; D007437:Intrinsic Factor; D014805:Vitamin B 12