Neonatal cystic fibrosis screening is a blood test that screens newborns for cystic fibrosis (CF). Cystic fibrosis is disease passed down through families that causes thick, sticky mucus to build up in the lungs and digestive tract. It can lead to breathing and digestive problems.

Cystic fibrosis screening - neonatal; Immunoreactive trypsinogen; IRT test

A sample of blood is either taken from the bottom of the baby's foot of a vein in the arm. A tiny drop of blood is collected onto a piece of filter paper and allowed to dry. The dried blood sample is sent to a lab for analysis.

The blood sample is examined for increased levels of immunoreactive trypsinogen (IRT), a protein produced by the pancreas that is linked to CF.

The brief feeling of discomfort will probably cause your baby to cry.

Children with CF who are diagnosed early in life and start treatment at a young age may have better nutrition, growth, and lung function. Newborn screening tests allow doctors to identify children with CF before they have symptoms.

Some states include this test in the routine newborn screening tests that are done before the baby leaves the hospital.

If you live in a state that does not perform routine CF screening, your health care provider will explain whether testing is needed.

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Infant blood sample

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Neonatal cystic fibrosis screening Results

Review Date: 06/01/2011
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)