Discrepancies between the urinary-excretion and plasma-level methods of measuring vitamin B 12  absorption.
D003036:Cobalt Isotopes; D003951:Diagnostic Errors; D005069:Evaluation Studies as Topic; D006801:Humans; D007408:Intestinal Absorption; D012546:Schilling Test; D014805:Vitamin B 12 / Q000097:blood / Q000378:metabolism* / Q000652:urine
D003036:Cobalt Isotopes; D014805:Vitamin B 12