Postprandial blood glucose is generally measured clinically as 2-hour postprandial blood glucose, if the 2-hour postprandial blood glucose reaches 13.8mmol/L, for both normal people and diabetic patients, it may be more serious. 1. The normal value of 2-hour postprandial blood glucose for normal people is below 7.8mmol/L. Therefore, a significant increase in 2-hour postprandial blood glucose of 13.8mmol/L may be caused by eating too many sweets, or by diabetes, infections, and other disease factors, which may be more serious, and it is recommended that you consult with a medical professional for a definitive diagnosis. 2. For patients who have been diagnosed with diabetes in the past, the general 2-hour postprandial blood glucose needs to be controlled at 10mmol/L or less, so the 2-hour postprandial blood glucose of 13.8mmol/L is significantly more than the control target, which may lead to diabetes, acute or chronic complications, such as diabetic ketoacidosis, diabetic nephropathy and so on, which may be more serious. When a patient has a 2-hour postprandial blood glucose of 13.8 mmol/L, it is recommended that he or she be seen by a physician.