Blood glucose 16mmol/L exceeds the normal blood glucose level and requires active hypoglycemic treatment. Clinically, the normal value of fasting blood glucose is 3.9-6.1mmol/L, and the normal value of two hours after meal is less than 7.8mmol/L. When the blood glucose is 16mmol/L, no matter it is fasting or two hours after meal, the blood glucose is higher than normal. Excluding stress, infection and other factors, repeated rechecks of blood glucose, still more than 11.1mmol / L, consider the possibility of diabetes mellitus. Excessive blood glucose can cause acute complications of diabetes, such as diabetic ketoacidosis; long-term high blood glucose level may cause diabetic nephropathy, diabetic retinopathy and other chronic complications. If you find that your blood sugar is too high, you need to consult a doctor, take glucose treatment under the doctor’s guidance, and monitor your blood sugar changes regularly.