Comparison of three methods for measuring vitamin B 12  in serum: radioisotopic, euglena gracilis and Lactobacillus leichmannii.
D000748:Anemia, Macrocytic / Q000097:blood / Q000188:drug therapy; D000752:Anemia, Pernicious / Q000097:blood; D001681:Biological Assay; D003036:Cobalt Isotopes; D004906:Erythrocyte Count; D005056:Euglena gracilis; D005492:Folic Acid / Q000627:therapeutic use; D005494:Folic Acid Deficiency / Q000097:blood / Q000188:drug therapy; D005743:Gastrectomy; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007778:Lactobacillus; D008722:Methods; D012156:Reticulocytes; D014805:Vitamin B 12 / Q000097:blood*; D014806:Vitamin B 12 Deficiency / Q000097:blood
D003036:Cobalt Isotopes; D006454:Hemoglobins; D005492:Folic Acid; D014805:Vitamin B 12