High blood pressure (hypertension)

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  • With Mayo Clinic emeritus hypertension specialist

    Sheldon G. Sheps, M.D.

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Question

Wrist blood pressure monitors: Are they accurate?

How accurate are wrist blood pressure monitors? Mine consistently shows a lower blood pressure reading than that taken by my doctor.

Answer

from Sheldon G. Sheps, M.D.

Wrist blood pressure monitors can be accurate if used exactly as directed. However, according to the American Heart Association, it's best to use a home blood pressure monitor that measures blood pressure in your upper arm. Devices for the upper arm are also easier to check for accuracy than are wrist monitors.

Wrist blood pressure monitors are extremely sensitive to body position. To get an accurate reading when taking your blood pressure with a wrist monitor, your arm and wrist must be at heart level. Even then, it's thought that because of differences in the width of the arteries in your forearm, and how deep the arteries are under your skin, blood pressure measurements taken at the wrist are usually higher and less accurate than those taken at your upper arm.

It's not uncommon for blood pressure readings taken at home on any type of monitor to be different from those taken at your doctor's office. If you have a wrist blood pressure monitor, it's a good idea to take your monitor to a doctor's appointment. Your doctor can then check your blood pressure with both a standard upper arm monitor and a wrist monitor in the correct position in the same arm to check your wrist blood pressure monitor's accuracy.

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References
  1. Choosing a home blood pressure monitor. American Heart Association. http://www.americanheart.org/presenter.jhtml?identifier=3069212. Accessed March 9, 2010.
  2. Schell KA, et al. The effects of anatomical structures on adult forearm and upper arm noninvasive blood pressures. Blood Pressure Monitoring. 2007;12:17.
  3. Domiano KL, et al. Comparison of upper arm and forearm blood pressure. Clinical Nursing Research. 2008;17:241.
AN01839 May 4, 2010

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