Nasal polyps occur in 10% of children and 48% of adults with cystic fibrosis. The prevalence of abnormal sweat tests and cystic fibrosis in adults with nasal polyps has not been reported. We therefore performed sweat tests on 35 adults with nasal polyposis seen in two allergists' office practice. Sweat sodium levels ranged from 12 to 65 mEq/L (median = 34). These were considered within the normal range for adults. Abnormal sweat tests and cystic fibrosis were not found in this series of adults with nasal polyps.
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