Some people like to monitor their own blood pressure because it gives them a sense of control over their treatment for high blood pressure. It can also be a good motivator if you're trying to lower your blood pressure by changing your lifestyle.

Your doctor may recommend home monitoring to assess changes in your medication. It's important you take a range of readings over several months and interpret the results with your doctor.

Some people become so anxious when they visit the doctor, their blood pressure shoots up. This is called "white coat hypertension" and it affects about one in five people. Home monitoring can help identify these people and eliminate unnecessary treatment.

Others, however, become anxious when using a home blood pressure monitor. If that's the case for you, don't buy one.

Buying tips

• Get the shop to demonstrate the monitor before you buy.
• If you're buying an arm monitor, make sure the cuff is the correct size for your arm. A cuff that's too narrow may overestimate your blood pressure and a cuff that's too wide may underestimate blood pressure.
• Make sure the buttons and displays are easy to see and read.
• When you first get your monitor take it to your doctor to have its accuracy checked and your technique. Repeat this every six months or so.
• Before using your monitor, read the instruction manual to familiarise yourself with the monitor and recalibrate according to the manufacturer's instructions. If you drop it or readings change abruptly, get it checked.

Using your monitor

• Don't test your blood pressure within 30 minutes of eating, drinking caffeinated drinks, or exercising.
• Relax for a few minutes before testing.
• Remove any jewellery or clothing that interferes with the cuff.
• For arm monitors, rest your arm on a waist-high table. For wrist monitors, keep your wrist level with your heart. It's important to use the same arm position each time you check your blood pressure. If you are seated keep both feet on the floor.
• Take two readings, about one to two minutes apart. If results differ by more than five points take a third reading and record an average of the results.
• Keep a record of all results and discuss these with your doctor.

Home monitors are not a substitute for the regular measurement of blood pressure by your doctor. Don't change your medication based on home readings - check with your doctor first. And talk to your doctor about the most appropriate monitoring regime.