There is no obvious relationship between blood glucose measurement and blood volume, but insufficient blood collection may cause some glucose meters to fail to measure results, and try not to squeeze your fingers to make them bleed. You should consult your doctor for specific precautions. Blood glucose meters mainly measure the amount of glucose in the blood, and measure blood glucose by reacting with glucose oxidase in blood glucose test strips to produce an electric current. Glucose oxidase oxidizes glucose into hydrogen peroxide, and the amount of hydrogen peroxide is subsequently measured by the system, which is not obviously related to more or less blood. Using a blood glucose meter to measure blood glucose, it is necessary to draw a sufficient amount of blood samples at once (some blood glucose meters can be allowed to draw a second blood sample), need to completely cover the test strip test area, insufficient blood collection may lead to some blood glucose meter can not measure the results, it is best to have sufficient blood, but do not overdo it with the squeezing. In addition, it should be noted that the purchase of blood glucose meter should go to the regular place to buy, and the blood glucose meter needs to be calibrated at regular intervals, you can go to the local hospital for calibration, you can also go to the place where you buy the blood glucose meter for calibration. If the patient thinks that the blood glucose detected by the glucose meter has errors, he can go to the hospital for blood glucose testing.