There are no symptoms of high blood pressure, so it's important to have your blood pressure checked regularly. We recommend that everyone aged 18 to 39 years without risk factors be screened every 3 to 5 years and people 40 years and older be screened once a year.
If you have high blood pressure, it should be checked more often. Ask your doctor what is best for you. Once your blood pressure is under control, have it checked every 6 to 12 months.
If your blood pressure is high at one reading, that doesn't mean you have high blood pressure. Blood pressure can vary depending on your activity level and time of day, and can be higher if you are sick or in pain.
Your doctor might want to have your blood pressure checked at least two more times — during visits that are one to two weeks apart — before making medical recommendations.
Blood pressure is measured using a device called a sphygmomanometer. Usually you are seated with your arm resting on a table. A cuff is placed around your upper arm and inflated until it stops the blood flow. Then the cuff is slowly deflated, allowing blood to flow again. As the cuff deflates, a stethoscope is used to listen to the blood flow in an artery at your inner elbow.
The first thumping sound heard reflects the blood pressure as the heart contracts (systolic pressure). When the thumping sound disappears, this is the lowest amount of pressure (diastolic) between heartbeats.
Some medical centers use automated machines which take blood pressures.
To prepare for a blood-pressure screening, follow these guidelines: