Cystic Fibrosis Carrier Screening - What Is Cystic Fibrosis?
Cystic fibrosis (CF) is an inherited disease caused by
a change (mutation) in the cystic fibrosis transmembrane regulator (CFTR)
gene. It is a chronic, progressive disease that causes
mucus to become thick and sticky. The mucus builds up
and clogs passages in many of the body's organs, but mostly in the
lungs and the pancreas 
. In the lungs, the mucus can cause serious breathing
problems and lung disease. In the pancreas, the mucus can cause digestive
problems and malnutrition, which can lead to problems with growth and
development.
WebMD Medical Reference from Healthwise
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