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Blood pressure test

A blood pressure test checks if your blood pressure is healthy, or if it's high or low.

Blood pressure is the term used to describe the strength with which your blood pushes on the sides of your arteries as it's pumped around your body.

Low blood pressure (hypotension) is not usually a problem, although it can cause dizziness and fainting in some people.

High blood pressure (hypertension) can increase your risk of developing serious problems, such as heart attacks and strokes, if it's not treated.

Having this quick test is the only way to find out what your blood pressure is and it could save your life.

When and where to get your blood pressure tested

You should have a blood pressure test if you're worried about your blood pressure at any time.

If you're over 40, you can have this test done as part of an NHS Health Check, which is offered to adults in England aged 40 to 74 every 5 years.

If you have been diagnosed with high or low blood pressure, or you have a high risk of developing either, you may need more frequent checks of your blood pressure.

You can get your blood pressure tested at a number of places, including:

  • most pharmacies
  • your local GP surgery
  • some workplaces

Get a free blood pressure check

If you're aged 40 and over, and are eligible, you may be able to get a free blood pressure check at a local pharmacy.

Find a pharmacy that offers free blood pressure checks

How blood pressure is tested

Blood pressure machines vary, but they're all a type of measuring device, which often have an arm cuff attached to it.

The cuff is usually wrapped around your upper arm and filled with air until it feels tight. This can feel uncomfortable but it only lasts a few seconds.

It's important to relax and not talk during this time, because this is when your blood pressure is measured.

If a healthcare professional is doing this for you, they may also use a stethoscope to record your blood pressure.

An automatic device usually picks up the measurements from sensors in the arm cuff, which are sent to a digital display.

You should get the results straight away.

How blood pressure is measured

Blood pressure is measured in millimetres of mercury (mmHg) and is given as 2 numbers:

  • systolic pressure – the pressure when your heart pushes blood out around your body
  • diastolic pressure – the pressure when your heart rests between beats and blood is pushed around your heart

The highest number is always the systolic pressure and it's always given first. For example, a blood pressure given as "120 over 80" or 120/80mmHg means a systolic pressure of 120mmHg and a diastolic pressure of 80mmHg.

Understanding your blood pressure reading

Your blood pressure reading can tell you how healthy your blood pressure is.

If you have a recent blood pressure reading use the NHS Check your blood pressure tool to understand what your reading means. You'll also get information about what to do next.

As a general guide:

  • normal blood pressure is considered to be between 90/60mmHg and 120/80mmHg (this applies if it's measured at home or at a pharmacy, GP surgery or clinic)
  • high blood pressure is considered to be 135/85 or higher if your reading was taken at home, or 140/90mmHg or higher if your reading was taken at a pharmacy, GP surgery or clinic
  • low blood pressure is considered to be 89/59mmHg or lower

If your reading is between 120/80mmHg and 140/90mmHg, you may be at risk of developing high blood pressure in the future. There are things you can do to help prevent high blood pressure.

Testing your blood pressure at home

Your GP may suggest 24-hour or ambulatory blood pressure monitoring (ABPM) if they think you may have high blood pressure (hypertension).

ABPM tests your blood pressure regularly over 24 hours, by using a cuff attached to a portable device that's worn on your waist.

You can continue with your daily activities during this time.

If you want to regularly check your blood pressure at home, you can buy a machine.

Blood pressure devices for home use

If you want to check your blood pressure regularly at home, you can buy a digital blood pressure machine.

Choose a machine that measures your blood pressure at your upper arm, not your wrist or finger.

Let your GP know you're doing this.

Last Reviewed
29 January 2024
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