Hi Brian.
Welcome.
The 2009 target levels for a Diabetic are as follows:
Fasting Bg (waking) ...............between 4 - 7 mmol/l.
2 hrs after meals...................no more than 8.5 mmol/l.
Anything above these levels paves the way for possible complications later on.
Hyperglycemia, hyperglycaemia, or high blood sugar is a condition in which an excessive amount of glucose circulates in the blood plasma. This is generally a blood glucose level of 10+ mmol/L , but symptoms may not start to become noticeable until later numbers like 15-20+ mmol/L or 15.2-32.6 mmol/L. However, chronic levels can produce organ damage.
Hope that helps.
Ken