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Diagnosing CF is a multistep process. A complete diagnostic evaluation should include a newborn screening, a sweat chloride test, a genetic or carrier test, and a clinical evaluation at a CF Foundation-accredited care center.

Close to 40,000 people in the U.S. have cystic fibrosis, a rare genetic disease. The majority of people with CF are diagnosed by age 2 thanks to newborn screening tests. If you have CF or are considering testing for it, knowing about the role of genetics in CF can help you make decisions about your health care.