Why Monitor Blood Pressure at Home?
High blood pressure (hypertension) affects around 1 in 3 adults in the UK and is a leading risk factor for heart attack, stroke, and kidney disease. Many people have high blood pressure without knowing it because it rarely causes symptoms. Home monitoring gives you regular readings in a relaxed setting, avoids “white coat hypertension” (artificially high readings caused by the stress of a clinic visit), and helps your GP track how well your medication is working. NICE guidelines now recommend home monitoring as part of diagnosing and managing hypertension.
Types of Home Blood Pressure Monitor
Upper arm monitors: The most accurate type for home use. A cuff wraps around the upper arm and inflates automatically. They are recommended by the British Heart Foundation and NICE guidelines. Prices range from £20-80. The Omron M3 and Omron M7 are among the most popular clinically validated models in the UK.
Wrist monitors: Smaller and more portable than arm monitors, but generally less accurate because wrist positioning affects the reading. They can be useful for people with very large upper arms where a standard cuff does not fit. They must be held at heart level during measurement for accurate results. From £15-50.
Connected/smart monitors: Bluetooth-enabled monitors that sync readings to a smartphone app, creating a log you can share with your GP. The Omron Connect app and Withings BPM Connect are popular options. These are particularly useful for people who monitor regularly and want to track trends over time. From £50-100.
Choosing a Clinically Validated Monitor
Not all blood pressure monitors are equally accurate. Look for models that have been clinically validated to international standards (BHS, ESH, or AAMI protocols). The British Heart Foundation maintains a list of recommended monitors. Omron, Microlife, and Withings consistently feature validated models. Avoid very cheap unbranded monitors that may give inaccurate readings.
Getting the Right Cuff Size
Using the wrong cuff size is the most common cause of inaccurate home readings. Measure around the middle of your upper arm. Standard cuffs fit 22-32cm. Large cuffs fit 32-42cm. Extra-large cuffs (up to 50cm+) are available for bariatric patients. Most quality monitors include a standard cuff with a large cuff available as an optional extra.
How to Take an Accurate Reading
Sit quietly for 5 minutes before measuring. Keep your feet flat on the floor and your arm supported at heart level. Do not talk during the measurement. Take two readings 1-2 minutes apart and record the average. Measure at the same time each day (morning and evening are recommended). Avoid caffeine, exercise, and smoking for 30 minutes before measuring. Always use the same arm.
Understanding Your Results
Home readings are typically slightly lower than clinic readings. A home reading below 135/85 mmHg is generally considered normal. Between 135/85 and 150/95 suggests possible high blood pressure that should be discussed with your GP. Above 150/95 needs medical attention. If you ever get a reading above 180/120, contact your GP or NHS 111 the same day as this may indicate a hypertensive crisis.
NHS Blood Pressure Testing
Free NHS blood pressure checks are available at your GP surgery, many pharmacies (through the NHS Blood Pressure Check Service), and some workplaces. If your GP suspects hypertension, they may lend you an ambulatory blood pressure monitor (ABPM) to wear for 24 hours, or ask you to take home readings for a week using your own monitor. If you are over 40 and have not had a check recently, booking one is strongly recommended.