pilocarpine iontophoresis sweat chloride test

pil·o·car·pine i·on·to·phor·e·sis sweat chlo·ride test

(pī'lō-kahr'pēn ī'ŏn-tō-fŏr-ē'sis swet klōr'īd test)
The definitive procedure for confirming the diagnosis of cystic fibrosis. The sodium and chloride levels in sweat are significantly elevated in children with cystic fibrosis. At least two positive test results are required before diagnosis is confirmed.