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What do difference in BP readings of either arms indicate?

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Posted on Wed, 20 Jul 2016
Question: What does it mean when your blood pressure is different from right to left arm?
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Answered by Dr. Lilit Baghdasaryan (33 minutes later)
Brief Answer:
May be a vascular problem if it is more than 20 mm Hg

Detailed Answer:
Dear Mrs,

Normally there can be a difference about 10 mm Hg between 2 subsequent measurements in the same arm, or in different arms.
If the pressure difference between arms is more than 20 mm Hg, then a vascular problem should be ruled out. In case of vascular diseases, when there is a narrowing or blockage in one of the arteries of the arm, in this arm you may measure lower pressure, which related to the fact that in such vessels blood travels slower and there is less blood that should be.
So if we measure more than 20 mm Hg difference between two arms, we repeat the measurements and if it persists then we perform some examinations, such as duplex ultrasound of vessels to find out the cause.

Hope this was helpful for you

Come back if you have any further questions

Take care,
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Lilit Baghdasaryan

Cardiologist

Practicing since :2007

Answered : 1536 Questions

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What do difference in BP readings of either arms indicate?

Brief Answer: May be a vascular problem if it is more than 20 mm Hg Detailed Answer: Dear Mrs, Normally there can be a difference about 10 mm Hg between 2 subsequent measurements in the same arm, or in different arms. If the pressure difference between arms is more than 20 mm Hg, then a vascular problem should be ruled out. In case of vascular diseases, when there is a narrowing or blockage in one of the arteries of the arm, in this arm you may measure lower pressure, which related to the fact that in such vessels blood travels slower and there is less blood that should be. So if we measure more than 20 mm Hg difference between two arms, we repeat the measurements and if it persists then we perform some examinations, such as duplex ultrasound of vessels to find out the cause. Hope this was helpful for you Come back if you have any further questions Take care,