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Iron absorption was measured in normal and irondepleted subjects by using Fe/sup 5//sup 9/ and a whole-body liquid scintillation counter. Normal iron-replete adult humans absorbed lO% or less of the orally administered test dose. Iron-deficient subjects absorbed 29 to 71%. The method requires a small dose of radioisotope, permitting repeated studies. It provides an index of the rate of iron loss, including loss by bleeding.
Hoek et al. (1961) studied this question.