You all have to understand that these levels are all relative to your childs age. You can't go by each other's doctor's views. Each child is different.  I don't understand why if these questions are so important to you that you don't ask your doctor????
My daughter had a crisis about a week ago and  I asked every question I could in the ER room. This was NOT her first crisis...but I still asked all the questions. Be aggressive and ask your Docs the questions instead of other parents, (of course I'm only talking about medical terms and info as this) .Of course keep asking questions to others about the condition. But when it comes to levels and vital stats ask your DoC. If your Doc doesn't answer SWITCH DOCTORS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!