Blood glucose is divided into fasting blood glucose, 2-hour postprandial blood glucose, and random blood glucose. Fasting blood glucose 6.6mmol/L is high, suggesting possible impaired fasting blood glucose; 2-hour postprandial blood glucose or random blood glucose of 6.6mmol/L is normal. The normal value of fasting blood glucose is 3.9~6.0mmol/L, if the value of fasting blood glucose is 6.1~6.9mmol/L, it is impaired fasting blood glucose, and diabetes should be considered if the value is ≥7.0mmol/L. Fasting blood glucose 6.6mmol/L suggests possible impaired fasting blood glucose. The manifestation is high fasting blood glucose, but normal two-hour postprandial blood glucose. The 2-hour postprandial blood glucose or random blood glucose is usually <7.8 mmol/L, so a 2-hour postprandial blood glucose or random blood glucose of 6.6 mmol/L is in the normal range. In order to make a clear judgment, blood glucose should be monitored regularly, and it is recommended to go to the hospital to improve the glucose tolerance test and glycosylated hemoglobin and other tests. Treatment is carried out under the guidance of the doctor.