Neonatal cystic fibrosis screening

Table of Contents

Alternative Names

Cystic fibrosis screening - neonatal; Immunoreactive trypsinogen; IRT test


Normal Values

If the test result is negative, the child likely does not have cystic fibrosis. However, if the baby has symptoms of cystic fibrosis, further testing may be needed.


What abnormal results mean

An abnormal (positive) result suggests that your child may have CF. However, it is important to remember that a positive screening test for cystic fibrosis does not diagnose cystic fibrosis. If your child's test is positive, further tests will be done to confirm the possibility of CF.

Not all children with a positive result have CF.



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)