Fasting blood glucose 7.8mmol/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 fasting blood glucose of 7.8mmol/L is elevated, and it is recommended to consult a professional physician for a clear diagnosis. 2. For patients who have been diagnosed with diabetes in the past, the general fasting blood glucose should be controlled between 4.4~7.0mmol/L, so the fasting blood glucose of 7.8mmol/L is more than the control target, and you can consult with a professional doctor to adjust the glucose lowering program. If abnormal blood glucose is found, it is recommended to consult a doctor in time for further examination and therapeutic intervention as prescribed by the doctor.