High blood pressure (hypertension)

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  • With Mayo Clinic emeritus hypertension specialist

    Sheldon G. Sheps, M.D.

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Mayo Clinic Health Manager

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Question

Free blood pressure machines: Are they accurate?

How accurate are the blood pressure machines in grocery stores and drugstores?

Answer

from Sheldon G. Sheps, M.D.

Not accurate enough to make health decisions regarding your blood pressure.

The blood pressure machines that you can use free of charge in many grocery stores and drugstores may have been accurate when first installed. But in order to stay accurate, they must be maintained and recalibrated. Generally, no information is available to the user regarding the care of these devices. As a result, the reading you get has limited value because it may be incorrect.

In addition, the blood pressure cuffs on these do-it-yourself machines are often too small to get an accurate reading on a significant number of people with high blood pressure. To ensure accuracy, the inflatable portion of the cuff should cover at least 80 percent of the upper arm.

It's best to have your blood pressure checked in a medical facility or in a community screening program with trained staff. Before diagnosing or treating high blood pressure, you'll need to have your blood pressure measured in your doctor's office at several separate visits.

If you need to check your blood pressure more frequently, your doctor can instruct you on the best way to monitor your blood pressure from home.

Next question
Wrist blood pressure monitors: Are they accurate?
References
  1. Viera AJ, et al. Hypertensive patients' use of blood pressure monitors stationed in pharmacies and other locations: A cross-sectional mail survey. BMC Health Services Research. 2008;22:216.
  2. Lewis C. Checking up on blood pressure monitors. FDA Consumer Magazine. 2002. http://www.fda.gov/Fdac/features/2002/502_hbp.html. Accessed April 14, 2009.
  3. Graves JW. Blood pressure measurement in public places. American Family Physician. 2005;71:851.
  4. Pickering TG, et al. Recommendations for blood pressure measurements in human and experimental animals. Circulation. 2005;111:697.
  5. Home monitoring of high blood pressure. American Heart Association. http://www.americanheart.org/presenter.jhtml?identifier=576. Accessed May 12, 2009.

AN00567

June 20, 2009

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