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How are newborns screened for cystic fibrosis (CF)?

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A doctor or nurse will draw a few drops of blood from your baby’s heel and send the sample to a lab. There, it’s checked for a chemical made by the pancreas called immunoreactive trypsinogen (IRT). This is often done with a blood test a few days after birth.

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 an immunoreactive trypsinogen (IRT) -based test?

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