How do i know if my blood pressure monitor is accurate

Q: Can home blood pressure monitors give false readings?

But home blood pressure monitors arent always as accurate as they should be. Home blood pressure monitors may be inaccurate in 5% to 15% of patients, depending on the threshold for accuracy used, according to Dr. Swapnil Hiremath, a kidney specialist at Ottawa Hospital in Canada.

A new study revealed that the majority of home blood pressure monitors dispense inaccurate readings. This is extremely upsetting because high blood pressure is the leading cause of death and disability worldwide. And millions of people concerned about blood pressure rely on these home blood pressure machines to determine whether they are at risk for cardiac disease, heart attack, stroke, and kidney damage. With so many people depending on an at-home blood pressure monitor, MD Now wants to alert the community to this widespread medical danger. Here we share the most important details from the study and helpful tips on how to check blood pressure at home. But if you would like the peace of mind of a more accurate blood pressure reading, remember that all MD Now locations welcome you to come in at any time for a free blood pressure check.

Table of Contents Show

Path to improved well being
What equipment do I need to measure my blood pressure at home?
How do I know if my monitor is accurate or if I am using it correctly?
How do I measure my blood pressure?
Things to consider
What does my blood pressure reading mean?
Medical terms
When to see the doctor
Questions to ask your doctor
Can home blood pressure monitors give false readings?
Why is my blood pressure monitor giving me different readings?
What is the most accurate way to measure blood pressure?

Get to the Heart of the Study Results

Dozens of at home blood pressure machines were tested in the study. According to the results, the participants’ home blood pressure monitor readings were off by around 5 mmHg a shocking 70% of the time. And respondents’ readings were off by 10 mmHg one-third of the time. The study also showed that men’s at-home blood pressure monitor readings were less accurate than women’s.

The researchers had difficulty identifying the exact reasons for erroneous readings, but they said that certain factors like blood vessel stiffness, arm size, and arm shape are often overlooked when companies develop a home blood pressure monitor. But luckily, there are many ways to ensure the best readings at home.

Healthy Advice on How to Check Blood Pressure at Home

While these findings are concerning, the American Heart Association (AHA) says you can still get accurate home blood pressure monitor readings by taking a few simple steps.

Find the best home blood pressure monitor. The AHA suggests choosing an automatic, cuff-style monitor that goes around your upper arm. A proper fit is essential and can greatly affect your readings. That’s why you need to measure your upper arm or ask your doctor to help you determine the right size to get before purchasing. Before you start using your new monitor, take it to your doctor to make sure it’s right for you.
For at least 30 minutes before using your monitor, stay away from caffeine, alcohol, and tobacco. All of these can cause your blood pressure to rise, which will skew your reading higher.
Try not to check your blood pressure when you’re stressed, are running around, or have just completed exercise. Instead, sit down comfortably and remain calm for about 10 minutes before checking your blood pressure. If possible, take readings at the time of day that you’re most relaxed.
When you’re relaxed and ready to use your blood pressure monitor, sit up straight on a sturdy chair with your back fully supported and both feet flat on the floor. Also, be sure that your arm is level with your heart, which you can do by placing it on a desk or table. Finally, only take a reading on bare skin since clothing can make it difficult to get an accurate result.

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Many people monitor their blood pressure at home. They often do this to manage or treat a certain health condition. If you monitor your blood pressure at home, keep a record or log of the measurements. The record shows your doctor how your blood pressure changes throughout the day. If you take medicines to control your blood pressure, it will help document if they are working. Measuring your blood pressure at home is a good way to actively manage your health.

Path to improved well being

What equipment do I need to measure my blood pressure at home?

To measure your blood pressure at home, you can use either an aneroid (manual) monitor or digital monitor. Choose the type of monitor that best meets your needs. Look at the following features when you select a monitor.

Size: The right cuff size is very important. The cuff size you need is based on the size of your arm. You can ask the doctor, nurse, or pharmacist to help you. Blood pressure readings can be wrong if your cuff is the wrong size.
Price: Cost may be a key factor. Home blood pressure units vary in price. You may want to shop around to find the best deal. Keep in mind that pricey units may not be the best or most accurate.
Display: The numbers on the monitor should be easy for you to read.
Sound: You must be able to hear your heartbeat through the stethoscope (if checking manually).

Tests show that finger and wrist devices do not always provide correct measurements. These devices are sensitive to placement and body temperature. They also are expensive and can cost more than $100.

Aneroid monitor

The aneroid monitor manually checks your blood pressure. It has a gauge that you read by looking at a pointer on the dial. The cuff goes around your upper arm, and you squeeze a rubber bulb to inflate it by hand.

Aneroid monitors often cost less than digital monitors. They range in price from about $20 to $40. The cuff has a built-in stethoscope. You don’t need to buy a separate one. The unit may have a feature that makes it easy to put the cuff on with one hand. It also is portable and can be carried easily from one place to another.

There are some drawbacks to the aneroid monitor. It is a complex device that can be damaged easily and become less accurate. The device may be hard to use if it doesn’t have a metal ring to tighten the cuff. This is what makes it easier to put on the cuff. Additionally, the rubber bulb that inflates the cuff may be hard to squeeze. This type of monitor may not be best for hearing-impaired people, because of the need to listen to your heartbeat through the stethoscope.

Digital monitor

Digital monitors are more popular for measuring blood pressure. They often are easier to use than aneroid units. The digital monitor has a gauge and stethoscope in one unit. It also has an error indicator. The blood pressure reading displays on a small screen. This may be easier to read than a dial. Some units even have a paper printout that gives you a record of the reading.

Inflation of the cuff is either automatic or manual, depending on the model. Deflation is automatic. Digital monitors are good for hearing-impaired patients, since there is no need to listen to your heartbeat through the stethoscope.

There are some drawbacks to the digital monitor. Body movements or an irregular heart rate can affect its accuracy. Some models only work on the left arm. This can make them hard for some patients to use. Digital monitors are more expensive. They range in price from about $30 to more than $100. They also require batteries.

How do I know if my monitor is accurate or if I am using it correctly?

Once you buy your device, have your doctor check it for accuracy. They should check your monitor once a year. On your own, periodically check the tubing for cracks and leaks. Proper care and storage are necessary. Make sure the tubing is not twisted when you store it. Keep it away from heat.

Ask your doctor or nurse to teach you how to use your blood pressure monitor correctly. This will help you achieve good results in controlling your blood pressure.

How do I measure my blood pressure?

Before you check your blood pressure, you should:

Wait 30 minutes after eating or using caffeine, alcohol, or tobacco products.
Go to the bathroom and empty your bladder.
Rest for 3 to 5 minutes and do not talk.
Sit in a comfortable position, with your legs and ankles uncrossed and your back supported.
Elevate your left arm to the level of your heart. Place it on a table or desk and sit still.
Wrap the cuff around the upper part of your bare arm. The cuff should be smooth and snug. There should be enough room for you to slip one fingertip under the cuff.
Check the placement of the cuff. The bottom edge of it should be 1 inch above the crease of your elbow.

Below are the steps to take to use an aneroid monitor.

Put the stethoscope earpieces into your ears. The earpieces should face forward, toward your eyes.
Place the stethoscope disk on the crease of your inside elbow.
Inflate the cuff by squeezing the rubber bulb. Keep squeezing until the pointer on the dial reaches 30 to 40 points higher than your last systolic reading. The systolic reading is the top number of blood pressure. Inflate the cuff at a rapid rate, not just a little at a time. Inflating the cuff too slowly will cause a false reading.
Slightly loosen the valve on the unit and slowly let some air out of the cuff. Deflate the cuff by 2 to 3 millimeters per second. If you loosen the valve too much, you won’t be able to measure your blood pressure.
As you let the air out of the cuff, you will begin to hear your heartbeat. Listen carefully for the first sound. Check the blood pressure reading by looking at the pointer on the dial. This number is your systolic pressure.
Continue to deflate the cuff. Listen to your heartbeat. You will hear your heartbeat stop at some point. Check the reading on the dial. This number is your diastolic pressure.
Write down the measurement in your record. The systolic pressure goes in front of the diastolic pressure. For example, 120/80.
If you need to repeat the measurement, wait 2 to 3 minutes before starting.

Below are the steps to take to use a digital monitor.

Turn the power on to start the unit.
On the automatic models, the cuff will inflate by itself with a push of a button. On the manual models, you have to inflate the cuff. You do this by squeezing the rubber bulb at a rapid rate.
After the cuff inflates, the automatic device will slowly let air out.
Look at the display screen to get your blood pressure reading. It will show your systolic and diastolic pressures. Write down the measurement in your record. The systolic pressure goes in front of the diastolic pressure. For example, 120/80.
Press the exhaust button to release all of the air from the cuff.
If you need to repeat the measurement, wait 2 to 3 minutes before starting.

Things to consider

What does my blood pressure reading mean?

Normal blood pressure is 120/80 or lower. High blood pressure is 140/90 or higher. If your blood pressure is between 120/80 and 140/90, you may have something called prehypertension. This means that you are at risk for high blood pressure.

If you have diabetes or kidney disease, high blood pressure ranges may be lower than for other people. Or, if you are older than 65, goal blood pressure may be higher. Talk to your doctor about what is considered high blood pressure for you.

Medical terms

Monitoring your blood pressure at home can be confusing. Below is a list of terms that are helpful to know.

Blood pressure: The force of blood against the walls of the artery.
Hypertension: High blood pressure.
Hypotension: Low blood pressure.
Brachialartery: A blood vessel that goes from your shoulder to below your elbow. You measure your blood pressure in this artery.
Systolic pressure: The highest pressure in an artery when your heart is pumping blood to your body.
Diastolic pressure: The lowest pressure in an artery when your heart is at rest.
Blood pressure measurement: A calculation of both the systolic and diastolic It is written or displayed with the systolic number first and the diastolic pressure second. For example, 120/80. This is a normal blood pressure reading.

When to see the doctor

The doctor should check your monitor at least once a year. This ensures that the measurements are accurate.

Only a doctor can diagnose you with high blood pressure. A diagnosis requires multiple readings, so keeping a log is important. You should also log the time of day you you’re your blood pressure. Contact your doctor if you have high readings for several days. Be sure to take your blood pressure log with you to the visit.

Hypotension is low blood pressure. This occurs when your systolic pressure is consistently below 90 or is 25 points below your normal reading. Contact your doctor if you have low readings. Hypotension can be a sign of shock, which is life threatening. Call your doctor right away if you are dizzy or lightheaded.

Questions to ask your doctor

Why do I need to monitor my blood pressure at home?
How often do I need to measure my blood pressure?
What type of monitor should I use?
What do my blood pressure readings mean?
What is considered a normal blood pressure for me?
What should I do if my readings are abnormal?
Are there any lifestyle changes I can make to help manage my blood pressure?
Do I need to take medicine to manage my blood pressure?
What other things can affect a blood pressure reading?

Resources

American Heart Association: Monitoring Your Blood Pressure at Home

This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject.

Can home blood pressure monitors give false readings?

But home blood pressure monitors aren't always as accurate as they should be. "Home blood pressure monitors may be inaccurate in 5% to 15% of patients, depending on the threshold for accuracy used," according to Dr. Swapnil Hiremath, a kidney specialist at Ottawa Hospital in Canada.

Why is my blood pressure monitor giving me different readings?

Expect variations between monitors. Not all BP monitors are calibrated exactly alike, which can lead to differences in readings. Some monitors may also be unreliable. The Omada BP monitor is FDA-cleared and has been shown to be accurate within +/- 10mmHG in clinical testing.

What is the most accurate way to measure blood pressure?

Intra-arterial measurement of BP is the most accurate method, capable of giving a continuous picture. Indirect recordings give a rough estimate of intra-arterial pressure but less information about the relationship between individual subjects and their environment.