Three-hour postprandial blood glucose 8.5mmol / L, such as diabetic patients is usually normal, belong to the control of sugar standard; non-diabetic patients is not normal phenomenon, need to further improve the examination after a clear diagnosis. Clinically, fasting blood glucose and 2-hour postprandial blood glucose are often used as assessment indicators. For patients who have been diagnosed with diabetes mellitus, the goal of glycemic control is generally fasting blood glucose 4.4mmol/L to 7.0mmol/L, and non-fasting blood glucose does not exceed 10.0mmol/L. Keeping the three-hour postprandial blood glucose at 8.5mmol/L indicates that the blood glucose is under effective control, and you can continue with your current diet, exercise and medication regimen. For people with undiagnosed diabetes, three-hour postprandial blood glucose should normally be close to the fasting blood glucose level, i.e., 3.9-6.0 mmol/L. 8.5 mmol/L is abnormal, and the diagnosis can be clarified by further tests. If the blood glucose test result is abnormal, it is recommended to consult a doctor in time to clarify the cause of the disease and to carry out targeted treatment or therapy with the help of a doctor.