Fasting blood glucose 8.5mmol/L is elevated for both normal people and diabetics. 1. The normal value of fasting blood glucose for normal people is between 3.9~6.1mmol/L, so a high fasting blood glucose of 8.5mmol/L may be due to diabetes, or high blood glucose caused by infection, stress, etc. It is recommended that you consult a medical professional for a clear diagnosis. 2. For patients who have been diagnosed with diabetes, fasting blood glucose should be controlled between 4.4~7.0mmol/L, so fasting blood glucose of 8.5mmol/L is not reached the control target, and professional physicians can be consulted to adjust the treatment program. Once the blood glucose level is found to be elevated, it is recommended to consult a doctor in time. Patients with abnormal blood glucose need to control their diet, avoid high intake of sugary foods, exercise appropriately, and monitor their blood glucose regularly.