Checking the Chloride (and Sodium) level in the sweat to see if excess salt is secreted through sweat is a diagnostic test for Cystic Fibrosis or CF.
Cystic Fibrosis
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Genetic testing and Sweat Test are some ways to screen the newborns for Cystic Fibrosis.
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Cystic Fibrosis is an inherited, genetic multi-system disease which lead to abnormally thick and sticky mucus production.