As the weather cools and blood pressure rises, monitoring good blood pressure becomes a top priority for many people again. At present, home blood pressure monitors are very popular, and many doctors also recommend that their patients monitor their blood pressure as closely as possible at home, and try not to rely on the blood pressure values measured during hospital visits, because home blood pressure testing is often more accurate than in the hospital, and the “white coat phenomenon” does not occur, the latter being the result of emotional stress and other factors in the hospital. The latter is a sudden, transient change in blood pressure that occurs in the hospital due to emotional stress and other factors. How to accurately measure blood pressure is an important part of the treatment of hypertension, today we introduce to you the method of measuring blood pressure using a home blood pressure monitor and precautions. There are three types of home blood pressure monitors, namely arm, wrist and finger. Of these 3 forms of electronic sphygmomanometers, the finger type electronic sphygmomanometer has been proven to be inaccurate and abandoned. Wrist type electronic blood pressure monitor is very suitable for the general healthy people, but for patients with combined vascular pathology (such as diabetes, high blood pressure, hypertension, etc.) will produce bias, these patients because of the hardening of blood vessels or peripheral circulation disorders, wrist and upper arm blood pressure measurement value will be very different. It is recommended that patients with these combined diseases and the elderly should choose an arm-type electronic blood pressure monitor. In addition, you should operate it in the field before purchasing in order to choose the right electronic blood pressure monitor for you. The following issues should be noted in the process of home blood pressure measurement: 1. 20 minutes before measuring blood pressure, do not have strenuous activities. Emotions should be relaxed, you can go to the toilet, holding urine will have a certain effect on blood pressure. 2, the blood pressure measurement as far as possible to choose the sitting position, rather than lying down. 3, measurement of blood pressure can not wear thick clothing such as sweaters, cuff to skin contact or only a thin clothing, measurement before the electronic sphygmomanometer cuff air exhausted, tied to the upper end of the left or right arm, the cuff tightly bound to the upper arm, the lower edge of the cuff should be in the elbow bend 2.5cm. 4, tied to the cuff of the arm should be flush with the heart (see the attached figure), open the electronic sphygmomanometer start button for measurement. During the measurement, relax your arm and open your palm, do not make a fist. Measure again after 3-5 minutes of rest and take the average value as the result of this measurement. 5, the best time to measure blood pressure is one hour after waking up or one hour before going to bed. For some patients with long-term hypertension or those who are adjusting the dose of antihypertensive drugs, it is recommended to measure every 4 to 6 hours on average. Because of the relationship between blood flow, there is usually some difference between the blood pressure measured in the left hand and the right hand; usually the blood pressure value of the left hand is slightly higher than that of the right hand, but a difference of 10 to 20 mmHg is normal, however, the higher measurement should prevail when recording. If the difference between the two hands is more than 40-50 mmHg, it is possible that there is a blockage in the blood vessels, and it is best to consult a physician to find out the cause. It is also worth pointing out that many people are using traditional mercury blood pressure monitors, and their measurements may be slightly lower than those of electronic blood pressure monitors. Since mercury sphygmomanometers are subject to thermal expansion and contraction, it is recommended that they be calibrated and zeroed every six months on average.