A fasting blood glucose of 6.9 mmol/L needs to be combined with a 2-hour postprandial blood glucose to decide whether treatment is needed. If the 2-hour postprandial blood glucose is not high, the blood glucose can be controlled by lifestyle changes, and if the 2-hour postprandial blood glucose is significantly elevated, medication is required. According to the diagnostic criteria for diabetes mellitus, diabetes mellitus can be diagnosed when the fasting venous blood glucose level is ≥7.0 mmol/L and there are diabetic symptoms such as polydipsia, polyphagia, polyuria, and body wasting. For those with fasting blood glucose 6.9mmol/L, it is recommended to complete the 2-hour postprandial blood glucose and glycosylated hemoglobin tests, and also complete the glucose tolerance test to assess whether they have diabetes mellitus and their recent blood glucose control. If the 2-hour postprandial blood glucose is not high, the blood glucose can be controlled by lifestyle changes (e.g., diet control, moderate exercise); if the blood glucose control is poor after lifestyle changes, medication should be added. If the 2-hour postprandial blood glucose is significantly elevated, medication is required. For fasting blood glucose 6.9mmol / L, we must consult a doctor in time, follow the doctor’s instructions for examination and treatment, the specific treatment should follow the doctor’s instructions.