Fasting blood glucose 6.9 mmol/L is not normal. The normal range of fasting blood glucose is 3.9~6.1 mmol/L, fasting blood glucose ≥7.0 mmol/L has reached the diagnostic standard of diabetes mellitus, fasting blood glucose 6.9 mmol/L does not reach the diagnostic standard of diabetes mellitus, which belongs to the impaired regulation of fasting blood glucose. If the fasting blood glucose value is between 6.1 and 7.0 mmol/L for several measurements, it is impaired fasting blood glucose regulation, and the patient may not use medication for the time being, and should actively intervene in lifestyle to prevent the development of diabetes mellitus. If the fasting blood glucose value is ≥7.0 mmol/L twice, then it should be considered as diabetes mellitus, and should be treated with glucose-lowering drugs such as acarbose and metformin as prescribed by the doctor. Therefore, patients with fasting blood glucose of 6.9 mmol/L should go to the hospital in time to get a clear diagnosis and timely treatment with the help of doctors to avoid further development of the condition.