Wow, scary. It's good that they're being so thorough. I'm sure it's very nerve-wracking for you though. I hope it goes smoothly for you and you get good news.
I don't know how much this will relate to your situation, but I'm pondering my ds' asthma, where we've lived, how that's changed his treatment plan and how the changes in treatment have affected his growth rate. It's amazing how connected it all is, and I've wondered if doctors are good about sharing this information with parents. We're a military family so the standard of care is different from the civilian world, and maybe that's why it took us so long to learn a lot of this stuff.
Anyway, he was born in Spokane, Washington, and for the longest time had eczema. We moved to Misawa, Japan (which is way up north and can get very humid), where he was diagnosed with allergy and asthma. When we went to England, it got worse. They had him on a very high dose of Advair (250/50 at age 9 - 51" tall and 60 lbs) and he continued with Claritin and Flonase (with albuterol as needed). We moved back to the States a couple of years ago, and the asthma doctor dropped him to a lower dose of Advair (100/50) and added Singulair.
We're living in a much dryer climate now and he's been able to discontinue the Claritin and Flonase, and his peak flows have soared. We were hoping to be able to either discontinue the Advair or Singulair at our last six month check-up, but his cardiopulmonary function tests weren't as good as he would've liked. Through discussions with this civilian doctor, we've learned that the best places for ds to live would be Alaska or Arizona.
And I don't know whether this is puberty or not (ds is 12), but he seems to be shooting up in height. I thought I'd read somewhere that the meds for asthma can affect growth, so now that his meds are being reduced I wonder if that's why he's sprouting.
So, I think I read that you were unpacking. Maybe the changes in the climate are affecting his asthma or lung function? It just seems like every time we moved we had to adjust his medication. But it doesn't sound as serious as your ds' situation. We've had nebulizer treatments and one hospital admission, but I think we've been pretty lucky with his asthma.
Well, I'll be hoping for good news! Hang in there, Mrs. Mungo, who's not related to Plaid Dad who used to be Mungo. ;)