The normal value of fasting blood glucose is 3.9~6.1mmol/L, 6.7mmol/L belongs to the high, if in the state of stress and is transient, can actively deal with the primary disease; if not in the state of stress, and the 2-hour blood glucose of glucose load is greater than or equal to 7.8mmol/L less than 11.1mmol/L, suggests that the glucose tolerance is reduced, can be temporarily without medication, only diet and exercise to control the blood glucose. The following are some of the reasons for this 1. If you are in surgery, infection, trauma and other stress, fasting blood glucose 6.7mmol/L, usually transient, remove the stress factors can be restored to normal blood glucose, you should actively treat the primary disease. 2. If non-stress state, fasting blood glucose 6.7mmol / L should be perfect glucose tolerance test, if the glucose tolerance after 2 hours of blood glucose is greater than or equal to 7.8mmol / L and less than 11.1mmol / L does not reach the diagnostic standard of diabetes, belongs to the pre-diabetic, can be diet and exercise to control blood glucose, temporarily do not need drug treatment. High fasting blood glucose should go to the hospital in time, to clarify the cause of the disease, according to the cause of the treatment.