24-hour ambulatory blood pressure monitoring is very accurate and can reflect more objectively the overall fluctuation pattern of blood pressure and the trend of elevation in the patient’s daily living condition. Because some patients may have white coat hypertension and have hypertension when measured in a clinic or hospital, 24-hour ambulatory blood pressure monitoring can help prevent the phenomenon of white coat hypertension because it is a small box that the patient carries on his or her body, and the patient’s mind is often more relaxed, which can more objectively and truly record the overall blood pressure of the patient throughout the day. 24-hour ambulatory blood pressure monitoring is currently is a more accurate and widely used means of confirming hypertension in the clinic, and for patients who are first found to have hypertension, three blood pressure measurements can be performed on non-same day.