Can someone tell me if just having the sweat test done is approaite anough to diagnose or not diagnose cystic fibrosis?? My son has had the sweat test several times each time it is negative but I ahve been told that perhaps he needs to have the blood dna test?? Ever heard of it?? He is 7 and has been struggling w/ Very Severe asthma since he was 6 months old. If anyone knows please let me know.
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