title: Failure of assay to identify low cobalamin concentrations.
authors: R
authors: R
authors: Carmel
authors: S
authors: S
authors: Brar
authors: A
authors: A
authors: Agrawal
authors: P D
authors: PD
authors: Penha
mesh_terms: D006801:Humans; D008163:Luminescent Measurements; D011865:Radioisotope Dilution Technique; D011933:Reagent Kits, Diagnostic; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D011933:Reagent Kits, Diagnostic; D014805:Vitamin B 12