The blood glucose meter is accurate, but the blood glucose meter generally needs to be recalibrated when replacing new test strips, and the blood glucose value measured without calibration will have deviation, which will lead to inaccurate blood glucose. The blood glucose meter should be calibrated at the hospital once every six months to a year to see if there is any error compared with the blood draw results. If there is an error, you need to find the reason or replace the blood glucose meter. For patients with diabetes, if they are on insulin therapy, they need to test their blood glucose 2-3 times a week. If you are currently using oral hypoglycemic drugs, you need to measure blood glucose about 3-5 times a month. If you have symptoms of hypoglycemia, such as cold sweats and hunger, you should always test your blood glucose, and if your blood glucose is high or low, you should go to the doctor in time.