Postprandial blood glucose generally refers to 2 hours postprandial blood glucose. 11.9mmol/L postprandial blood glucose is not normal, which is considered to be diabetes and needs close observation of blood glucose changes. If a patient has been diagnosed with diabetes, postprandial blood glucose 11.9mmol/L is also a high level, which means that the blood glucose is not well controlled, and it is necessary to change the medication or adjust the lifestyle to control the blood glucose at a reasonable level. Under normal circumstances, blood sugar after meal should be <7.8mmol/L, and random blood sugar should not exceed 11.1mmol/L. 11.9mmol/L after meal is considered the occurrence of diabetes mellitus. For patients who have been diagnosed with diabetes, a postprandial blood glucose of 11.9 mmol/L indicates poor blood glucose control. If the patient is younger and has fewer complications, it is best to control the postprandial blood sugar at 8.0-8.5mmol/L. For older diabetic patients, it is recommended to control the postprandial blood sugar at less than 10mmol/L. For diabetic patients with postprandial glucose of 11.9mmol/L, it is important to check whether the patient's diet control is up to standard and whether the exercise is reasonable. If the diet and exercise are reasonable, but the post-meal blood sugar is still at 11.9mmol/L, pay attention to whether there is infection or the current treatment plan is not very suitable, you should follow the doctor's advice to increase the medication or adjust the treatment plan to control the blood sugar at a reasonable level, which can reduce the occurrence of acute complications and delay the development of chronic complications.