Fasting blood glucose 5.5mmol/L is generally normal, two hours after meal blood glucose 8.5mmol/L is high, it is recommended to consult a doctor. The normal range of fasting blood glucose is 3.9~6.1mmol/L, so fasting blood glucose 5.5mmol/L belongs to the normal range; the blood glucose concentration two hours after meal should be less than 7.8mmol/L, so two hours after meal blood glucose 8.5mmol/L is on the high side, belongs to the abnormal glucose tolerance. Abnormal glucose tolerance is a metabolic state between diabetes and normal blood glucose. It is generally recognized that a two-hour postprandial blood glucose of 7.8~11.1mmol/L and a fasting blood glucose of less than 7.0mmol/L belongs to impaired glucose tolerance. It is recommended to go to the hospital and ask your doctor to make a judgment when you have abnormal blood glucose values.