All content on Lab Tests Online has been reviewed and approved by our Editorial Review Board.
At a Glance
Why Get Tested?
When to Get Tested?
When screening newborns for CF (all U.S. states screen for CF and some states use this test for screening); when an older child or adult has signs and symptoms of CF or a positive CF screening test; when someone wants to know their carrier status, such as a woman who is pregnant or considering pregnancy for the first time
A blood sample drawn from an infant's heel by collecting a spot of blood onto filter paper; for older children or adults, a blood sample obtained by inserting a needle into a vein in the arm; sometimes a scraping of the inner cheek (buccal swab) or, for prenatal testing, amniotic fluid obtained through amniocentesis or a chorionic villus sample
Test Preparation Needed?