Quantitative assay of intrinsic factor activity by urinary excretion of radioactive vitamin B12.
D001681:Biological Assay; D001826:Body Fluids; D005750:Gastric Juice; D006397:Hematinics; D006801:Humans; D007437:Intrinsic Factor; D014805:Vitamin B 12 / Q000652:urine*
D006397:Hematinics; D007437:Intrinsic Factor; D014805:Vitamin B 12
GASTRIC JUICE; VITAMIN B12/in urine