The best indicator of cystic fibrosis is
A positive sweat test (i.e., a sweat chloride level greater than 60 mEq/L) is diagnostic of cystic fibrosis.
A positive family history of cystic fibrosis
The presence of digital clubbing
A sweat test with a chloride concentration of 70mEq/L
Bronchiectasis on a chest x-ray
All India exam