A sweat test is performed on an infant with a suspected diagnosis of cystic fibrosis (CF). The nurse reviews the results of the test and notes that the chloride level is 40 mEq/L. The nurse interprets that this finding is indicative of:

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Chloride levels in a sweat test are used to diagnose cystic fibrosis. A level between 30 to 59 mEq/L is considered borderline and suggestive of CF, often requiring a repeat test for confirmation. Levels above 60 mEq/L are typically indicative of CF, while levels below 30 mEq/L are usually considered negative.

A Sweat Test Is Performed on an Infant with a Suspected