A technique has been developed for accurately assaying serum and urine (57)Co cyanocobalamin during the conventional Schilling test. Serum and urine radioactivity in a large number of patients has been correlated and the precise normal limits have been determined by statistical analysis. The implications of this for investigating conditions other than pernicious anaemia and the malabsorption syndromes are stressed.
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Donaldson et al. (1970) studied this question.
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