title: Value of 48- or 72-hr urine collections in performing the Schilling test.
mesh_terms: D000328:Adult; D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012546:Schilling Test / Q000592:standards*; D013997:Time Factors