Fasting blood glucose 6.8mmol/L is already higher than normal, normal human fasting blood glucose is 3.9-6.1mmol/L, 2 hours after meal blood glucose is not sure, need to be measured to know. Blood glucose generally refers to glucose in the blood, glucose is an important part of the body, but also an important source of energy, the normal value of fasting blood glucose is usually 3.9-6.1mmol/L, 2 hours after meals, blood glucose is less than 7.8mmol/L. Fasting blood sugar 6.8mmol / L is high, need to measure the blood sugar 2 hours after meals, timely hospitalization, clear with or without diabetes, under the guidance of the doctor for further treatment.