What are dangerous blood sugar levels?

Dangerous blood sugar levels is called diabetic hyperosmolar syndrome.If your blood sugar level goes above 600 milligrams per deciliter (mg/dL), or 33.3 millimoles per liter (mmol/L), the condition is called diabetic hyperosmolar syndrome. When blood sugar is very high, the extra sugar passes from the blood into the urine. Not only this, the person can also slip into coma if not treated on time.