If two people who are carriers have a child, that child may have CF. When two carriers have a child together, there is a l-in-4 (25%) chance with each pregnancy that the child will have CF. This is true even if they already have other children with-or-without CF.

If CF testing shows both parents are carriers, you might then see a specialist for genetic counseling. This person could give you more information and help you decide if you want to test the baby for CF. This could be done around the 11th week of pregnancy using CVS (chorionic villus sampling). This involves removing a tiny piece of the placenta. Or it could be done around the 16th week of pregnancy using amniocentesis, a procedure where a needle is used to take fluid from around the baby for testing. If either test shows that the baby will develop CF, you could choose to either terminate or continue the pregnancy.