Cystic Fibrosis Carrier Screening - What Causes CF?
Cystic fibrosis (CF) is a
genetic disorder. A child must inherit two defective
CF genes (one defective gene from each parent) to have the disease.
A person who has inherited only one defective CF gene is a
carrier of CF and does not have the
disease but can pass it on to his or her children. This person can also pass on
- If only one parent is a carrier of a defective
CF gene, the child will not have CF. But there is a 50% (1-in-2) chance that
the child will be a CF carrier.
- If both parents are carriers, there
is a 25% (1-in-4) chance that the child will have CF, and a 50% chance that the
child will be a carrier.