Lew, first of all, I don't think any question is dumb. We are looking at surgery for my daughter at the end of the month and I just sent an email to the nurse (as per her request) with 30(!) questions. She offered to answer them all. We will see.
Anyway, that is a question I have thought about but since it isn't a priority, I let it go (for now).
I hope your son is doing better. I know he was going through a rough time for awhile.