24-Hour Ambulatory Blood Pressure Monitoring monitors blood pressure values continuously for 24 hours and diagnoses high blood pressure based on the average blood pressure value. Ambulatory blood pressure monitoring is a method of automatically measuring blood pressure by an instrument at regular intervals of 15-30 minutes for 24 hours or more. Currently, the normal reference range of ambulatory blood pressure is considered to be: 24-hour average blood pressure <130/80mmHg, average daytime blood pressure <135/85mmHg, average nighttime blood pressure <120/70mmHg. Ambulatory blood pressure monitoring helps to diagnose hypertension at an early stage, assists in identifying primary, secondary, refractory hypertension, white coat hypertension, and occult hypertension, and also helps to assess the degree of blood pressure elevation, short-term variability and circadian rhythms, as well as the effectiveness of treatment. Patients are advised to undergo ambulatory blood pressure monitoring tests under the supervision of a physician and have the report interpreted by the physician for treatment and intervention to avoid delays.