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My son was suspected of CF last year, but a sweat test was normal. We are not sure though as we have recently heard you can still carry the gene and get it later as a kid and that he should have gene testing. He is small for age and we have had him to an ENT and immunologist for this nose/throat clearing that is sometimes all day long. He did have a few sinus infections and tried many, many meds to dry him up and shrink nasal passages, but they did nothing. Just had him there yesterday and once again, lot's of thick clear junk in his nose per the Dr. Do you think we should bother getting tested?