Well, that is one step down but to be completely safe the full ambry genetic test is the way to go. Take it from me who has tested in the 30 range when I was in my teens and because of that I was told I did not have Cystic Fibrosis. I wish they had the genetic testing back then to prove otherwise. I would have received proper treatment so much earlier.
I am not complaining but since we have the medical technology to use more than one test to confirm CF we should avail ourselves of it when warranted and your son's situation warrants a more accurate diagnosis. I hope his correct diagnosis, whatever it turns out to be, is found soon so that he can get all the medical treatments needed to be the healthiest he can me.
Keeping you and Aiden in prayer.<img src="i/expressions/heart.gif" border="0">