Blood pressure measurement is the primary means of assessing blood pressure levels, diagnosing hypertension, and observing the efficacy of antihypertensive therapy. Currently, there are three main methods used in clinical and population-based prevention and treatment: in-office blood pressure, ambulatory blood pressure, and home blood pressure. Let’s talk about “ambulatory blood pressure”. I. What is ambulatory blood pressure As shown above, the use of ambulatory blood pressure monitors validated by BHS, AAMI and ESH programs, the monitoring time must reach 24 hours or more, usually the measurement time can be selected to measure once every 20 minutes during the day and once every 30 minutes at night. (In the outpatient clinic, you can first go to the ECG room to make an appointment, and a professional will bring the ambulatory blood pressure monitor for you. 24 hours later, the monitor will be removed and the blood pressure report will be issued by the ECG room.) Second, the clinical use of ambulatory blood pressure can diagnose white coat hypertension, detect hidden hypertension, check the cause of intractable hypertension, assess the degree of blood pressure elevation and the efficacy of antihypertensive drugs, short time variation and circadian rhythm, etc. Third, what can ambulatory blood pressure tell us (monitoring parameters) Through the ambulatory blood pressure report card, we can learn the 24-hour, daytime and nighttime average blood pressure, the highest and lowest blood pressure; 24-hour blood pressure trend graph; systolic blood pressure > 140 mmHg times percentage, diastolic blood pressure > 90 mmHg times percentage; nighttime blood pressure drop percentage, blood pressure circadian rhythm, etc., to assist further clinical assessment and treatment.