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 in-terprets that this finding is indicative of:
1. A negative test
2. A positive test
3. An unrelated finding
4. Suggestive of CF and requires a repeat test
4
Rationale: In a sweat test, sweating on the infant's forearm is stimulated with pilocarpine, the sample is collected on absorbent material, and the amount of sweat chloride is measured. A chlo-ride level higher than 60 mEq/L is considered to be a positive test result. A sweat chloride level lower than 40 mEq/L is considered normal. A sweat chloride level higher than or equal to 40 mEq/L is suggestive of CF and requires a repeat test. "A negative test," "a positive test," and "an unrelated finding" are incorrect interpretations of the test results.
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