The normal reference range of blood glucose for fasting serum test is 3.9 to 6.1mmol/L, the normal value of 2 hours postprandial blood glucose is less than 7.8mmol/L, and the normal value of random blood glucose is less than 11.1mmo/L. If the test is for fasting blood glucose, then 6.2mmol/L is on the high side, and if it is for 2 hours postprandial blood glucose and random blood glucose, it is normal. Fasting blood glucose refers to the blood glucose measured before breakfast when you have not eaten any food for at least 8~10 hours. The normal reference range for fasting blood glucose is 3.9 to 6.1 mmol/L. If the test is for fasting blood glucose, then 6.2 mmol/L is high. Postprandial 2-hour blood glucose is the blood glucose measured 2 hours after eating, the normal value is less than 7.8mmol/L, random blood glucose is the blood glucose measured at any time of the day, the normal value is less than 11.1mmol/L, so no matter the postprandial 2-hour blood glucose or the random blood glucose 6.2mmol/L is normal. If there is an abnormality in blood sugar, it is recommended to consult a doctor in time.