Blood glucose level should not be above 7 mmol/L two hours after eating. That is, in fact, the diagnostic criterion for diabetes. Anyway, diabetes can not be diagnosed based only on one glucose level measuring. Further testing, such as a fasting plasma glucose, random plasma glucose, or two-hour postprandial plasma glucose level, need to be performed.

What was your blood glucose level after fasting?

Other disorders, beside diabetes, that can cause hyperglycemia could be:

1. eating disorders (bulimia nervosa);
2. some medications (beta blockers, thiazide diuretics, corticosteroids, niacin, pentamidine, protease inhibitors, L-asparaginase,[1] and some antipsychotic agents);
3. acute stress such as stroke or myocardial infarction;
4. during times of infection and inflammation.