An ambulatory blood pressure monitor is fitted to automatically measure and record your blood pressure at set intervals over a 24-hour period. The portable monitor is worn around the neck and is connected to a cuff that is placed on your upper arm. The device is set up to measure your blood pressure every 30 minutes whilst you are awake and every hour whilst you are asleep. A diary will be given at the time of fitting for you to record when medications are taken. Doctors usually request an ambulatory blood pressure monitor when blood pressure is high, fluctuating, or difficult to control with medication. This appointment will take approximately 10 to 15 minutes and you will be asked to return the following day to have the device removed (approximately 5 minutes).