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What happens in a sweat test for cystic fibrosis (CF)?

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To do a sweat test, a doctor rubs a small area of the skin on your arm with a special gel that activates the sweat glands. He’ll use a weak electrical current to push this medicine into the skin. It doesn’t hurt, but may cause a tingling, warm feeling.

Sweat will collect for 30 minutes in a special sweat collection device that is attached to your arm, and then the sample will be sent to a lab. High amounts of salt will confirm CF.

SOURCES:

National Heart, Lung, and Blood Institute: “How is Cystic Fibrosis Diagnosed?”

Mayo Clinic: “Cystic Fibrosis.”

Cystic Fibrosis Foundation: “Newborn Screening for CF,” “Testing for CF,” Sweat Test.”

KidsHealth: “Cystic Fibrosis (CF) Chloride Sweat Test.”

March of Dimes: “Cystic fibrosis and pregnancy.”

NHS: “Causes of Cystic Fibrosis,” “Diagnosing Cystic Fibrosis.”

Reviewed by Dan Brennan on May 07, 2019

SOURCES:

National Heart, Lung, and Blood Institute: “How is Cystic Fibrosis Diagnosed?”

Mayo Clinic: “Cystic Fibrosis.”

Cystic Fibrosis Foundation: “Newborn Screening for CF,” “Testing for CF,” Sweat Test.”

KidsHealth: “Cystic Fibrosis (CF) Chloride Sweat Test.”

March of Dimes: “Cystic fibrosis and pregnancy.”

NHS: “Causes of Cystic Fibrosis,” “Diagnosing Cystic Fibrosis.”

Reviewed by Dan Brennan on May 07, 2019

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What is carrier testing for cystic fibrosis (CF)?

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