Fasting blood glucose 6.2mmol/L is an abnormal phenomenon, need to be combined with the 2-hour postprandial blood glucose, the specific analysis. Fasting blood glucose usually refers to at least 8 hours without eating calorie-containing food measured blood glucose value, the normal fasting blood glucose value is 3.9-6.1mmol / L. Fasting blood glucose 6.2mmol / L is slightly higher than the normal range, is not normal. Combined with the 2-hour postprandial blood glucose, the patient’s blood glucose status can be categorized into three scenarios: 1. 2-hour postprandial blood glucose <7.8 mmol/L is diagnosed as impaired fasting glucose; 2. 7.8 mmol/L ≤ 2-hour postprandial blood glucose <11.1 mmol/L, then it can be diagnosed as impaired glucose tolerance. 3. 2-hour postprandial blood glucose or random blood glucose ≥11.1mmol/L, combined with the typical clinical manifestations of diabetes such as polyphagia, polydipsia, polyuria and weight loss can be diagnosed as diabetes mellitus. The first two are pre-diabetes (a state between diabetes and normal blood glucose), which requires timely lifestyle adjustments to help restore health; while diabetic patients need to consult a doctor in a timely manner and strictly follow medical advice. In conclusion, if your blood glucose level is slightly higher than normal at 6.2mmol/L, you should go to the hospital as soon as possible for a detailed checkup, and then follow your doctor's advice to take appropriate preventive and therapeutic measures after a clear diagnosis.