Laboratory confirmation of the diagnosis of cystic fibrosis.

The recent commercial introduction of a method for detecting albumin in meconium 
makes screening for cystic fibrosis feasible for many hospitals. If the 
tests is adopted, confirmatory tests should be available. Quantitative analyses of 
sweat for sodium by flame photometry and for chloride by silver 
titration and ion-sleective electrodes are now used as confirmatory tests. We 
compare results of these confirmatory methods applied to presons with cystic 
fibrosis, respiratory disorders, or digestive disorders, and to control subjects. 