Blood pressure recording outside of the doctor's surgery is recommended in most people who are suspected of having high blood pressure. This is because readings taken while people are going about their daily lives are more accurate than those taken in a doctor's surgery. They may also be used to give the doctor information about how well a blood pressure medicine is working. The ideal method - ambulatory blood pressure monitoring - uses a portable recorder.
Blood pressure form & 24 hour blood pressure monitoring form BP Home Assessment Form
For more details please read the attached Blood Pressure Monitoring Information Leaflet: Blood pressure monitoring leaflet