Fasting blood glucose 8.2mmol/L has exceeded the normal range and belongs to the serious range. If it is combined with typical diabetic symptoms at the same time, the diagnostic standard of diabetes has been reached, and active intervention is needed under the guidance of the doctor. Normal fasting blood glucose range is 3.9-6.1mmol/L, fasting blood glucose ≥ 7.0mmol/L and have typical diabetes symptoms can be diagnosed as diabetes, should be timely access to medical care, improve the glycated hemoglobin, glucose tolerance test and other tests, typing by a professional doctor, according to different types of diabetes, to formulate individualized diagnosis and treatment plan. For patients with type 2 diabetes, a fasting blood glucose of 8.2mmol/L is considered serious, which is beyond the range of 4.4-7.0mmol/L recommended by China’s guidelines for the treatment of type 2 diabetes mellitus, so it is recommended that they seek medical attention in a timely manner, and adjust the glucose-lowering drug regimen under the guidance of a doctor. Fasting blood glucose 8.2mmol/L is recommended to consult a doctor in time and follow the doctor’s instructions to use medication.