All happy aero tests are alike, all unhappy aero tests are unhappy in their own way. There are so many ways that failure to fit can occur that you need to dive into the actual data to see what happened. It's hard to diagnose just from a VE profile. That is, VE is a very sensitive diagnostic but because so many things go into it, it's hard just from the profile alone to figure out which of those many things went wrong.

Usually when there's a lack of fit, I have to go through a checklist of things that may have gone wrong. Unfortunately, right now, diagnosing lack of fit is sort of like drawing an owl.



At some point those of us who know what to do have to fill in a bit more about step 2.