5 Reasons Your Blood Pressure Reading Might Be Wrong

An inaccurate blood pressure reading can be frustrating — and it can cause unnecessary worry. Small details in how and when you measure can make a real difference.

1. The cuff is the wrong size

A cuff that is too small or too large can affect the result. Use a validated monitor with a cuff that fits your upper arm properly, and follow the manufacturer’s instructions.

2. You have not rested first

Rushing upstairs, exercising or dealing with a stressful call immediately before a test may temporarily raise your reading. Sit quietly for around five minutes before measuring.

3. You are talking or moving

Talking, laughing, scrolling on your phone or moving your arm can interfere with the test. Keep both feet on the floor, sit with your back supported and rest your arm on a table.

4. Your posture is affecting the result

Crossed legs, an unsupported arm or a cuff placed over clothing can all reduce accuracy. Keep your arm supported at heart level and place the cuff on bare skin.

5. One reading is being treated as the answer

A single high result does not always show your usual blood pressure. Take a second reading after about one minute and record both. Look for a pattern across several days if you have been advised to monitor at home.

What about white coat syndrome?

Some people have higher blood pressure in a medical setting because they feel anxious. Home monitoring may help give a fuller picture, but always discuss repeated high readings with a clinician.

Log the details, not only the number

When you record a reading, note the time, whether you had exercised, and how you felt. Pulse makes it easier to see whether high readings happen at a particular time or in a particular situation. Create your Pulse account.