What range should the blood sugar of diabetic patients be controlled in?

Diabetes patients need surgery, it is recommended to control blood sugar well. Generally speaking, fasting blood sugar should be controlled between 4.4~7.0mmol, non-fasting blood sugar should be kept ≤ 10.0mmol, and surgery can be considered. After surgery, blood sugar should be measured every day, and diet should also maintain a low sugar and low fat diet.