A two-hour postprandial blood glucose of 8.1 mmol/L is considered high for people with undiagnosed diabetes; however, it is not considered high for people with diabetes and is considered normal. Blood glucose less than 7.8mmol/L two hours after meal is normal, 7.8-11.0mmol/L is hypoglycemia, ≥11.1mmol/L with diabetes symptoms can be diagnosed as diabetes. So 8.1mmol/L for impaired glucose tolerance, you can further test fasting blood sugar, glycated hemoglobin and other indicators. For diabetic patients, the goal of glycemic control is generally non-fasting blood glucose does not exceed 10.0mmol/L, so two hours after meals blood glucose 8.1mmol/L is normal, belong to the glycemic control standard. Two hours after meals blood glucose 8.1mmol / L, it is recommended to timely visit the endocrinology department, standardized treatment.