saffie
I haven't checked out any of your other posts, but assume that your son is young and new to diabetes?
The amounts being given to you about how much insulin to use at the moment might change, as you get used to carb counting, and effects of insulin etc can be seen..
But another book that is handy to get hold of, that goes through the carb counting regime or should I say, multiple injections a day or basal/bolus.. Is a book called Using Insulin by John Walsh, this will underpin the bedec on-line course, plus will give you a wealth of information concerning controlling blood glucose levels, and how to work corrections needs, insulin to carb rations etc are all worked out..