Good idea. I don't worry about a target level because the normal target level is 100 on the blood sugar and the closer I can get to that, the better I feel.
I don't know that there is a specific high target level and it is reasonable that it would vary for different people. A diabetic coma is a frightening thing, as is a stroke. Even a TIA or bloody eyes that my mother had is scary to me. Also we would like to keep our blood pressure at a "normal" level. That's hard to do sometimes. I am working on it and the numbers are going down. Dorisena