Fasting blood glucose 6.8mmol/L is high and abnormal for normal people; it is within the target range and normal for diabetic patients. 1. The normal value of fasting blood glucose for normal people is between 3.9 and 6.1mmol/L. Therefore, high fasting blood glucose of 6.8mmol/L may be caused by infection, stress and other factors, or diabetes, and it is recommended to consult with a professional physician for a clear diagnosis. 2. For patients who have been diagnosed with diabetes, fasting blood glucose should be controlled between 4.4 and 7.0 mmol/L. Therefore, fasting blood glucose of 6.8 mmol/L can reach the control target, and can be continued with the current treatment program. Once the blood glucose level is found to be elevated, it is recommended to consult a doctor in a timely manner, to clarify the condition under the guidance of a professional physician, and to actively control the blood glucose, so as not to cause adverse consequences.