Which blood sugar levels are too high?

Anything above norma. Anything above normal. Diabetes is diagnosed by a glucose above 200 at any time or situation; a fasting (no food for 8 hours or more) greater than 100; a two hour post-meal glucose greater than 130-140. All of these are blood drawn in a lab, not finger sticks. An hba1c test of 6.5 or greater is also diagnostic for diabetes. For more info go to diabetes.Org.