Push for the genetic blood test -- get the full test over 1300 or 1400 mutation -- don't let them do only a screening for 39 or 89 mutations -- it's too easy to miss them -- that's way too many to not be looking for.
Unfortunately it will take longer to get the results.
You could also ask for the fecal elastase fat test, just for the sake of knowing -- it would still take about a week (I think) and would show if he is pancreatic sufficient or not.
You can check out my blog page (link at the bottom) for some basic info about sweat tests and genetic test -- not exactly what your problem is at the moment but it would be good to know about just in case they say the sweat test is normal.
Unfortunately it will take longer to get the results.
You could also ask for the fecal elastase fat test, just for the sake of knowing -- it would still take about a week (I think) and would show if he is pancreatic sufficient or not.
You can check out my blog page (link at the bottom) for some basic info about sweat tests and genetic test -- not exactly what your problem is at the moment but it would be good to know about just in case they say the sweat test is normal.