What is a dangerous level of HbA1c?

HbA1c less than 5.6 is normal: values between 5.7-6.4 are Pre-diabetes and more than 6.4 is diabetes. Simply looking at the sugar levels (including HbA1c) and often controlling them with drugs and insulin is not the way to go since several trials repeatedly emphasized that tight control of blood sugars with intensive drug therapy increased cardiovascular complications and mortality. Increased Blood sugar is just a sign of diabetes and not a disease by itself. It is due to Insulin resistance, which needs to be addressed primarily which in turn reduces blood sugar level.