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 have become very popular, and many doctors also advise their patients to 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 measurement is often more accurate than in the hospital, and the white coat phenomenon does not occur”, the latter is a sudden 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 a combination of these 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 measuring blood pressure at home: 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 impact on blood pressure. 2, 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 clothes such as sweaters, cuff to contact with the skin or only a thin clothing, measured 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. The lower edge of the cuff should be 2.5 cm above the elbow. 4. The arm with the cuff tied should be flush with the heart (see attached figure), and the start button of the electronic sphygmomanometer should be turned on for measurement. During the measurement, relax your arm and open your palm without making 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 their dose of antihypertensive medication, it is recommended that measurements be taken 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.