Conductivity determined by a new sweat analyzer compared with chloride concentrations for the diagnosis of cystic fibrosis.

Objectives: The aim of the study was to determine if a new conductivity measuring sweat test system (Nanoduct) could reliably identify patients with cystic fibrosis (CF) and differentiate them from healthy subjects.

Study Design: On the same day and in the same patient, the new system was tested in comparison with the Macroduct sweat collection system measuring chloride concentration and osmolality.

Results: Subjects (n = 111) 3 weeks to 60 years of age were investigated.