“Diabetic fasting 18” generally refers to the fasting blood glucose of diabetic patients 18mmol / L, excluding acute infections, trauma and other factors affecting blood glucose, diabetic patients with fasting blood glucose 18mmol / L has far exceeded the normal value, more serious. Fasting blood glucose generally refers to at least 8~10 hours without food measured blood glucose concentration, diabetic patients fasting blood glucose control range of 4.4~7.0mmol / L, so fasting blood glucose 18mmol / L has far exceeded the control target. Fasting blood sugar 18mmol / L may induce diabetic ketoacidosis and other acute complications of diabetes, and long-term poor control of fasting blood glucose may also induce diabetic nephropathy, diabetic foot, diabetic retinopathy and a series of chronic complications, serious harm to the patient’s health, more serious. Fasting blood sugar 18mmol / L diabetic patients are recommended to go to the hospital, under the guidance of the doctor to lower sugar treatment.