A 2-hour postprandial blood glucose of 12mmol/L requires further examination, and medication may be required if diabetes is diagnosed and blood glucose cannot be controlled by dietary modifications, exercise, and other means. Excluding acute infections, trauma and other factors affecting blood glucose, the normal range of two-hour postprandial blood glucose should be less than 7.8mmol/L, greater than or equal to 11.1mmol/L has reached the diagnostic criteria for diabetes, so when the two-hour postprandial blood glucose 12mmol/L need to be suspected of having diabetes. At this time, further examination should be carried out, such as fasting blood glucose test, glucose tolerance test, etc., also need to be combined with the presence of polydipsia, polyphagia, polyuria, weight loss and other diabetes-related clinical manifestations to make a comprehensive judgment. Once the diagnosis of diabetes mellitus is confirmed and the blood sugar cannot be controlled through dietary modification and exercise, medication may be needed. If you have a blood glucose of 12 mmol/L 2 hours after dinner, we recommend that you go to the hospital and ask your doctor to make a judgment.