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Cystic Fibrosis




What are the chances of cf if 1st sweat test taken on say day 1 shows abnormal, but 2 tests taken next day 1 hour apart & on different arms show borderline?

thanking you.


While impossible to quantify, there is a chance that the correct diagnosis is CF. This is a frustrating situation, which certainly does occur. Unfortunately the tests have to be repeated until a clear answer is found or alternative testing should be pursued.

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Response by:

Karen S McCoy, MD Karen S McCoy, MD
Professor of Pediatrics
Professor at the School of Allied Medical Professionals
College of Medicine
The Ohio State University