title: Simultaneous measurement of free and intrinsic factor (IF) bound vitamin B12 (B12) absorption; absolute quantitation with incomplete stool collection and rapid relative measurement using plasma B12 (IF): B12 absorption ratio.
mesh_terms: D000748:Anemia, Macrocytic / Q000378:metabolism; D003036:Cobalt Isotopes; D005243:Feces / Q000032:analysis; D006801:Humans; D007408:Intestinal Absorption; D007437:Intrinsic Factor / Q000032:analysis / Q000097:blood / Q000378:metabolism*; D008286:Malabsorption Syndromes / Q000378:metabolism; D014805:Vitamin B 12 / Q000032:analysis / Q000097:blood / Q000378:metabolism*
chemical_list: D003036:Cobalt Isotopes; D007437:Intrinsic Factor; D014805:Vitamin B 12