Measurement of blood pressure can be measured both left-handed and right-handed, if the difference between left-handed and right-handed blood pressure is more than 20mmHg, you need to be vigilant about arteritis and other diseases, and then you need to take the arm on the side of the high blood pressure as the standard. Clinically, there is no clear regulation on whether to measure the left hand or the right hand for blood pressure measurement, generally the difference between the left hand and the right hand blood pressure value is generally not more than 20mmHg, so the measurement of the left hand and the right hand blood pressure can be a true reflection of the body’s blood pressure level. If the difference in blood pressure between the left and right hands is more than 20mmHg, the patient should consider that the difference is caused by arteritis, atherosclerosis and other diseases, and then the arm on the side with high blood pressure should be measured. Measuring the blood pressure of the left hand and the right hand can reflect the body’s blood pressure level, it is recommended to maintain a stable mood when measuring blood pressure, and let the sphygmomanometer keep the same level with the measuring site and the heart when measuring blood pressure. In addition, when measuring blood pressure, you need to take three consecutive measurements and take the average value, which is conducive to reflecting the level of blood pressure.