So many symptoms.......the sweat test which was the only dx tool for years is not unflawed. IMHO it should be used in conjunction with genetic testing & evaluation of symptoms. There is always the possibility that the other mutation (if it is exists) is an undiscovered one. Would they consider treating your child as IF there was positive CF dx and that way minimal damage might be done. In the meantime you can push for additional testing etc as the extended panel adds more mutations over the years. As far as "not looking like a CFer". That statement alone pisses me off big time. Not everyone is sickly looking from day 1.....Good Luck!