Fasting blood glucose 7.4mmol/L exceeds the normal range, which is more serious. For normal people, the normal value of fasting blood glucose is 3.9~6.1mmol/L. In general, if the fasting blood glucose ≥7.0mmol/L, the diagnostic standard of diabetes mellitus can be reached, and at present, the fasting blood glucose has already reached 7.4mmol/L. If the patient has the symptoms of three more and one less (drinking more, eating more, urinating more, and losing weight), or if the fasting blood glucose is rechecked again, and if the result of the test is still ≥ 7.0 mmol/L, can be diagnosed as diabetes. Once diagnosed with diabetes mellitus, it is important to actively cooperate with the doctor to take treatment. It is possible to control blood glucose in a reasonable range by adjusting the diet structure, exercise and taking oral hypoglycemic drugs under the guidance of the doctor, such as metformin, glimepiride, and so on. When an increase in blood glucose level is detected clinically, it is recommended to consult the endocrinology department of a regular hospital.