[The sweat test in cystic fibrosis].

The high concentration of Na and Cl in the sweat of patients with Cystic Fibrosis is directly due to the primary pathogenetic defect, the reduced transport of Cl-Ions through cell membranes of exocrine glands. The most reliable method for the sweat test is by Gibson and Cooke. In good correlation are the results of the Wescor Macroduct System. This method is easier to perform, but needs special instruments.