Glucose in the laboratory test generally refers to blood glucose concentration, blood glucose concentration of 15mmol / L is high, suggesting the possible existence of diabetes, should go to the hospital as soon as possible to the endocrinology department for consultation. Once diagnosed, diabetes should be treated with hypoglycemic drugs as prescribed by the doctor. The normal range of fasting blood glucose is 3.9-6.1mmol/L, and the normal range of two-hour postprandial blood glucose should be less than 7.8mmol/L. Whether it is fasting blood glucose or random blood glucose, two-hour postprandial blood glucose 15mmol/L meets the diagnostic standard of diabetes. It is also necessary to improve the glucose tolerance test and other tests, once the diagnosis of diabetes should follow the doctor’s instructions to use hypoglycemic drugs, such as metformin, gliclazide, etc. or injections of insulin therapy, with appropriate physical exercise, diet control, blood glucose control within a reasonable range. Patients with blood glucose of 15mmol/L should go to the hospital as soon as possible, and ask the doctor to make a judgment and give a treatment plan. The use of drugs must follow the doctor’s instructions, not blindly use their own drugs, so as not to cause adverse consequences.