Under the premise of regulating the use of blood glucose meter for measurement, fasting venous plasma glucose should be higher than fingertip blood glucose, and postprandial venous plasma glucose is the same as fingertip blood glucose. 1. Measurement of fingertip blood: Insert the disposable blood glucose test strip into the portable blood glucose meter, take the fingertip blood, and the value will be displayed on the monitor of the blood glucose meter. This method is relatively simple and suitable for diabetic patients to self-monitor their blood glucose at home. When the blood glucose is too high beyond the range of the blood glucose meter, the meter will not be able to display the blood glucose value. 2. Venous blood measurement: Taking venous blood to measure blood glucose value, this method can only be carried out in the hospital, the measured blood glucose value is more accurate. When the blood glucose value cannot be measured by portable blood glucose meter, you can choose to take venous blood to measure the blood glucose value. 3. Under the premise of standardized use of blood glucose meter for measurement, fasting venous plasma glucose should be higher than fingertip glucose, and postprandial venous plasma glucose is the same as fingertip glucose. The above two methods are commonly used in clinical practice to measure blood glucose accurately. It is recommended that diabetic patients monitor their fasting blood glucose and 2-hour postprandial blood glucose daily. If there is any discomfort, consult a doctor promptly.