The difference between finger blood and venous blood glucose is that finger blood is capillary blood glucose, but it is convenient to collect blood and suitable for daily monitoring, while venous blood is extracted from the vein to detect blood glucose, which is more accurate, but needs to be monitored in medical institutions. Finger blood glucose is clinically known as fingertip blood glucose, is through the instrument to monitor the fingertip capillary blood glucose, the current blood glucose meter equipment is small and convenient, suitable for patients to monitor blood glucose daily at home. Venous blood glucose refers to the supernatant obtained by centrifugation after blood collection in a medical institution before blood glucose testing, which can remove the interference of blood impurities, so the blood glucose test value is more accurate, and the deviation between venous blood glucose and fingertip blood glucose is generally no more than 15%. Therefore, in order to improve the accuracy of fingertip blood glucose, it is necessary to ensure that the fingers are clean and dry when collecting blood, and the blood glucose meter should be calibrated regularly according to the venous blood glucose index. If there is any discomfort, consult a doctor.