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Adult Cystic Fibrosis Diagnosis
How is cystic fibrosis (CF) diagnosed?
A medical history and a physical exam are often the first steps in diagnosing CF. This is followed by screening or lab tests.
The diagnosis of CF requires one of the following:
- Early symptoms of CF
- A brother or sister who has CF
- A positive newborn screening test
Also, there must be at least one of the following:
- A genetic test showing that a person inherited a changed gene (known as the CFTR gene) from each parent.
- A positive sweat test showing a higher-than-normal level of chloride in sweat.
- An abnormal nasal potential difference test. This test uses electrodes on the lining of the nose to see how well salts flow into and out of cells.