First of all, to understand the normal order of taking fingertip blood glucose measurement, should first use alcohol disinfection, alcohol air dry, use the blood collection needle to pierce the fingertip, generally to remove the low first drop of blood, and then the second or third drop of blood used for fingertip blood glucose measurement. Because the first drop of blood sometimes will be contaminated, such as alcohol, will lead to inaccurate results, and in the blood collection needle piercing the finger, take the needle which may also be in direct contact with the first drop of blood, especially when the operation is not standardized, will produce contamination of the first drop of blood, will also cause the results to be accurate. So when monitoring the fingertip blood usually squeeze out the first drop of blood and then use the second or third drop of blood to measure blood glucose, the results will be more accurate.