Postprandial blood glucose of 13mmol/L is usually serious, if combined with symptoms of excessive drinking, eating, urinating and weight loss, the diagnostic criteria for diabetes have been met and active treatment is required. For diabetic patients, it usually belongs to the sugar control does not meet the standard. Diabetes can be diagnosed when the 2-hour postprandial blood glucose or random blood glucose is greater than 11.1 mmol/L, combined with the typical three more and one less symptoms of diabetes. For diabetic patients, the goal of glycemic control is generally in the non-fasting blood glucose does not exceed 10.0mmol / L, but the elderly or patients with poor basal conditions can be appropriately relaxed glycemic control goals. So postprandial blood glucose 13mmol/L, it is recommended to actively seek medical treatment, timely treatment under the guidance of the doctor.