If blood glucose is monitored by blood at the end of the fingers, in terms of the effect on the results, it is fine to test either finger, but it is usually recommended to choose the ring finger or the pinky finger instead of the thumb and index finger for the convenience of daily life. In general, the ring finger and little finger are often chosen for blood collection, and the pain is weaker. The ring finger is chosen the most often, this is because the ring finger is usually used less, calluses are less, blood is also more abundant, easy to pierce the blood collection, if the patient ring finger has been lanced several times, you can change the little finger. However, it is usually not recommended to choose the thumb and index finger, because these two fingers are used frequently, and after puncturing to take blood, it is easy to have pain and infection when touching other items. In addition, it is recommended to collect blood on both sides of the fingers, as the nerve endings on both sides are less distributed and less likely to produce pain. Before measuring blood glucose, patients should disinfect their fingers with alcohol and then take blood, and it is recommended to choose the second drop of blood for testing. Be careful not to squeeze the finger hard, so as not to contain too much tissue fluid in it and make the value of blood glucose not constant and inaccurate. In addition, it is better for diabetic patients to test the venous blood once at the hospital after testing the fingertip blood for about 2 months, in case the blood glucose meter is not allowed; test the glycated hemoglobin once every six months or so, so that patients can have a comprehensive understanding of their blood glucose in order to control the disease. When significant changes occur in blood glucose to communicate with the doctor in time to adjust the treatment plan.