Introduction

  • When blood pressure is high, it
    starts to damage the blood vessels, heart, and kidneys. This can lead to
    heart attack,
    stroke,
    kidney disease, and other problems. But if you don’t measure your blood pressure, you won’t know when it’s high, because there are
    usually no symptoms.
  • A home blood pressure monitor makes it easy to keep
    track of your blood pressure.
  • You can check your blood pressure at different times and in different places (such
    as at home and at work) during the day.
  • Checking your blood pressure at home helps you work with your doctor to diagnose and manage your blood pressure. Checking it at home does not replace having it checked by your doctor.

How to take your blood pressure at home

Blood pressure monitors

There are two types of blood pressure
monitors:

  • Automatic monitors. These are easier to use. They do the listening for you.
  • Manual monitors. This is the kind of device you usually see at the doctor’s office. It
    involves using a stethoscope to listen to the heartbeat.

Buying and maintaining a monitor

When you first get a blood pressure
device, check its accuracy. Do this by comparing
its readings with those you get at
the doctor’s office. Ask your doctor or nurse to watch you
use your device to make sure that you are doing it right
and that it works right. It’s a good idea to
have your device checked every year at the doctor’s office.

The size of the
blood pressure cuff and where you place it can greatly
affect how accurate your device is. If the cuff is
too small or
too large, the results won’t be right. You may have to measure your arm and choose a monitor that comes in the right size.

A monitor that measures blood pressure in your arm is recommended for most people. Blood pressure monitors used on the wrist aren’t as reliable as those that use arm cuffs. Wrist monitors should be used only by people who can’t use arm cuffs for physical reasons. And devices that use finger monitors aren’t recommended at all.footnote 1

Check your blood
pressure cuff often. Make sure all of the parts of your monitor are in good condition. Even a small hole or crack in the
tubing can lead to inaccurate results.

Getting
ready

Before you take your blood pressure:

  • Don’t eat,
    smoke, or exercise for at least 30 minutes. And don’t use any medicines
    that can raise blood pressure, such as certain nasal sprays.
  • Rest
    at least 5 minutes before you take a
    reading.
    Sit in a comfortable, relaxed
    position with both feet on the floor. Don’t move or talk while you are measuring your
    blood pressure.
  • Try not to take your blood
    pressure if you are nervous or upset.
  • If you can,
    use the same arm for every reading. Readings may be 10 to 20 mm Hg
    different between your right arm and your left arm.

Remember that blood pressure readings
vary throughout the day. They usually are highest in the morning after you wake
up and move around. They decrease throughout the day and
are lowest in the evening.

When you first start taking your blood pressure at home, always take your blood pressure 3 times. Wait 1 to 2
minutes between recordings to let the blood flow back into
your arm. After you get better at doing it, you
probably will need to do it only once or twice
each time.

Using an automatic blood
pressure monitor

  1. Sit with your arm slightly bent and
    resting comfortably on a table so that your upper arm is on the same level as
    your heart.
  2. Wrap the blood pressure cuff around your bare upper
    arm. The lower edge of the cuff should be about
    1 inch (2.5 cm) above the bend of your elbow.
  3. Press the on/off
    button.
  4. Wait until the ready-to-measure “heart” symbol appears next
    to zero in the display window.
  5. Press the start button. The cuff
    will inflate.
  6. After a few seconds, the cuff
    will begin to deflate. The numbers on the screen will begin to drop.
  7. When the measurement is complete, the heart symbol stops flashing.
    The numbers tell you your blood pressure and pulse.

Using a manual blood pressure monitor

If you’re not familiar with
using a stethoscope, you may want to get help from
someone who is. The accuracy of a blood
pressure recording depends on putting the stethoscope
in just the right place.

  1. Sit with your arm slightly bent and
    resting comfortably on a table so that your upper arm is on the same level as
    your heart.
  2. Wrap the blood pressure cuff around your bare upper
    arm. The lower edge of the cuff should be about
    1 inch (2.5 cm) above the bend of your elbow.
  3. Close the valve on the rubber
    inflating bulb. Squeeze the bulb rapidly with your opposite hand to inflate the
    cuff. Keep squeezing until the dial or column of mercury
    reads about 30 mm Hg higher than your usual
    systolic pressure. (If you don’t know your usual
    pressure, inflate the cuff to 210 mm Hg.) The pressure in the cuff will
    temporarily stop all blood flow in your
    arm.
  4. Put the stethoscope over the
    large artery slightly above the inside of your elbow. You can find
    this artery by feeling for its pulse with the fingers of your other
    hand. If you are using a cuff with a built-in stethoscope, be sure the part of
    the cuff with the stethoscope is over the artery. Don’t let the
    stethoscope rub on the cuff or your clothing. This may cause noises that make
    your pulse hard to hear.
  5. Open the valve
    on the bulb just slightly. The numbers on the
    pressure dial or mercury tube should fall gradually-about 2 to 3 mm
    Hg per second. Some devices automatically control the fall at this rate.
  6. Listen through the stethoscope. As you watch
    the pressure slowly fall, note the number on the dial or
    tube when you first start to hear a pulsing or tapping sound. The sound is caused by the blood starting to
    move through the closed artery. This is your systolic blood pressure.
  7. Continue letting the air out slowly. The sounds
    will become muffled and finally will disappear. Note the
    number when the sounds completely disappear. This is your diastolic blood pressure. Finally, let out all the remaining air to take
    the cuff off.

Keep a blood pressure
diary

Keep a blood pressure diary. Your records may help explain changes in your blood
pressure readings and help your doctor make sure you get the right treatment.

Everyone’s blood pressure
changes from day to day and even from minute to minute sometimes. Blood pressure tends to be higher in the morning and
lower at night. Stress, smoking, eating, exercise, cold, pain, noise,
medicines, and even talking can affect it.

Record your blood pressure numbers with the date and time. You might use a home blood pressure log (What is a PDF document?) or a spreadsheet on your computer. Your monitor might have a feature that will record your numbers for you. Some monitors can transfer this information to
your computer.

Also
record your daily activities, such as the time you take medicine or if you feel
upset or feel stressed.

References

Citations

  1. American Heart Association. (2005). Recommendations for blood pressure measurement in humans and experimental animals. Part 1: Blood pressure measurement in humans. AHA Scientific Statement. Hypertension, 45(1): 142-161.

Other Works Consulted

  • Weber MA, et al. (2013). Clinical practice guidelines for the management of hypertension in the community. Journal of Clinical Hypertension. DOI: 10.1111/jch.12237. Accessed December 19, 2013.

Credits

ByHealthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD – Internal Medicine
Specialist Medical Reviewer Adam Husney, MD – Family Medicine

Current as ofOctober 5, 2017