For undiagnosed diabetic people, three hours after meal blood glucose 6.6mmol / L may not be normal, high, should also be combined with diet and fasting blood glucose and 2 hours after meal blood glucose comprehensive assessment; for diabetic patients, it is normal, belong to the glycemic control standard. Normal people half an hour after the meal blood glucose rise, about an hour or so peak, two hours began to decline, three hours close to fasting blood glucose (fasting blood glucose 3.9 ~ 6.0mmol / L for normal). So three hours after meals blood sugar 6.6mmol / L may be abnormal, the clinical use of fasting and 2 hours after meals blood sugar as an assessment indicator, it is recommended to improve the examination. For diabetic patients, the goal of glycemic control is generally in the fasting blood glucose 4.4mmol/L ~ 7.0mmol/L, and the non-fasting blood glucose does not exceed 10.0mmol/L. Therefore, the three-hour postprandial blood glucose 6.6mmol/L is normal. It is recommended that you consult your doctor for the results of the three-hour postprandial blood glucose test.