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How is a cystic fibrosis sweat test performed?

In a cystic fibrosis sweat test (sweat chloride test), a sweat-producing chemical is applied to a small area of skin and the collected sweat is then tested to see if it's saltier than normal. The sweat chloride test is usually done when the infant is a month old to ensure the sample is large enough to be analyzed. The sweat test can determine if the infant carries the cystic fibrosis gene or has the condition. Other tests to diagnose cystic fibrosis include taking DNA samples from blood or saliva, which can be checked for specific defects on the gene responsible for cystic fibrosis.

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