title: Competitive binding radioassays for vitamin B12 in biological fluids or solid tissues.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002606:Charcoal; D003037:Cobalt Radioisotopes; D011869:Radioligand Assay; D014805:Vitamin B 12 / Q000032:analysis*
chemical_list: D003037:Cobalt Radioisotopes; D002606:Charcoal; D014805:Vitamin B 12