I've had chronic sinus issues & one sinus surgery (which helped tremendously!). I also have had recurrent bronchitis & pneumonia as a kid. I had a 15 year pretty healthy spell until 2 years ago when I got a nasty lung bug (MAC). I wasn't diagnosed with CF until earlier this year at age 43 - and only then because of genetic testing. My sweat tests in as a teenager and at 40 were borderline normal and interpreted as negative. If I'd have had the CF screening it would have shown me as a carrier. But full genetic testing identified 2 other very rare mutations. Infact one was only ever seen once before and one I'm the first to have (my daughter is the second). Are you sure about the carrier only status? ~Juliet