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Kinderspital Landeskrankenanstalten Salzburg.
In 43 children and adolescents (30 healthy and 13 CF patients) the Quantitative Pilocarpine Iontophoresis Test (QPIT) was compared with the ion-specific electrode. We found an excellent correlation between these two methods (r = 0.93) and no false positive or false negative results. With both procedures the total chloride-ion-concentration in sweat of healthy subjects and patients with CF differed significantly (p less than 0.001). Both, the original Gibson and Cooke-sweat-test (QPIT) and the assessment of chloride with the sensitive electrode are highly reliable procedures for confirming the diagnosis of CF.
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