It is best to use 75% alcohol to sterilize the blood glucose test. This is because the iodine contained in iodophor can easily interfere with the blood glucose test strips and react with the enzymes in the test strips, resulting in abnormal test values. The color of iodine can also interfere with the test paper and affect the blood glucose test value. In addition, the following points should be noted when measuring blood glucose: 1. After using 75% alcohol to disinfect during the test, the alcohol should be completely evaporated and clean before testing, which can ensure the accuracy of the test; 2. The needle should be stuck slightly deeper during the test, if it is too shallow and bleeds little, the tester may squeeze the local tissue, causing too much tissue fluid, which may affect the test value of blood glucose; 3. The patient uses In the process of testing blood glucose with blood glucose test paper, patients must see whether the blood glucose test paper is within the expiration date, if the test paper is expired, the test value will also be inaccurate; 4. Patients should also pay attention to the process of measuring blood glucose, the basic value of venous blood and fingertip blood in the fasting state is the same, but in the 2 hours after meal blood glucose, fingertip blood may be a little higher than venous blood. Because the fingertip blood contains micro-artery, micro-vein and tissue fluid as a mixture, due to the increase of blood sugar after 2 hours of meal, the micro-artery also has a certain amount of blood sugar, so the fingertip blood sugar is easily slightly higher than the venous blood sugar.