title: [Determination of serum vitamin B 12 levels using a radioisotope method. Technic and results in 140 cases].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003037:Cobalt Radioisotopes; D005260:Female; D006402:Hematologic Diseases / Q000097:blood*; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D003037:Cobalt Radioisotopes; D014805:Vitamin B 12
vernacular_title: Determinación de los niveles séricos de vitamina B12 por un método radioisotópico. Técnica y resultados en 140 casos