Blood glucose 6.6 if the fasting blood glucose value of 6.6mmol / L, belongs to the high but did not reach the diagnostic criteria for diabetes, at this time reasonable control of diet, appropriate exercise, blood glucose is likely to return to normal; if the postprandial blood glucose 6.6mmol / L, belongs to the normal blood glucose. Fasting blood glucose 3.9-6.0mmol/L is normal, 6.1-6.9mmol/L is impaired fasting blood glucose regulation, ≥7.0mmol/L at the same time diabetes symptoms can be diagnosed as diabetes. So fasting blood glucose 6.6mmol / L, impaired fasting glucose regulation, belonging to the pre-diabetic period, at this time actively adjust the diet, appropriate exercise, weight control, blood glucose is possible to return to normal levels. When you find fasting blood glucose value of 6.6mmol/L, you should consult a doctor in time, under the guidance of a professional doctor active treatment.