Serum zinc levels have been measured in twenty-four asthmatic patients, of whom sixteen were on long term corticosteroid therapy. They were carefully screened to exclude any concomitant disease. The non-steroid-treated asthmatics had normal serum zinc levels which ranged from 89 to 138 μg/ml. The corticosteroid-treated patients had a mean serum zinc level of 64 ± 9 μg/100 ml; this was significantly lower than normal (P = < 0·001).
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