Presented here are chloride results obtained by direct titration of undiluted sweat collected with the Webster Sweat Collection System. Six hundred and thirty-two sweat chloride results were reported on 604 patients. Thirty-six of thirty-nine sweat chloride results of 60 mM or greater were from patients with cystic fibrosis. Three results (61, 63 and 64 mM) were from a 12-year-old female who had one episode of rectal prolapse but after one year does not have clinical evidence of cystic fibrosis. There was one patient with a cystic fibrosis variant with intermediate range sweat chloride. All others in the intermediate range (40–59 mM) did not have cystic fibrosis. One patient with a sweat chloride reported of less than 40 mM was subsequently found to have cystic fibrosis at another institution.

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