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What is a "sweat test" to diagnose cystic fibrosis (CF)?

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A “sweat test” is thought to be the most reliable way to tell if someone has CF. It checks the amount of salt in your sweat. People with CF have higher levels of chloride, a compound in salt.

This test can be done on people of any age. But some babies might not sweat enough and may need to be tested more than once.

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

NEXT QUESTION:

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

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