2h postprandial blood glucose 15 is usually 15mmol/L, generally belong to the postprandial blood glucose is high, not normal. Normal people 2 hours after meal blood glucose to be below 7.8mmol / L, if there is no diagnosis of diabetes, 2 hours after meal blood glucose 15mmol / L, this blood glucose value may be diabetes; if diagnosed with diabetes, it means that the postprandial blood glucose control is unstable, high, need to adjust the hypoglycemic drugs, strict control of the diet synergistic exercise therapy, so that the blood glucose down. The diagnostic criteria for diabetes is that the 2-hour postprandial blood glucose is greater than or equal to 11.1mmol/L and have typical diabetes symptoms. If diagnosed with diabetes, prolonged high blood glucose may lead to complications of diabetes, it is necessary to go to the endocrinology department of the hospital in a timely manner to regulate blood glucose, so that blood glucose control in the normal range.