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The upper arm is good because for one it is accessable. You can measure it on the thigh but that requires taking your pants off. Also, take gravity and the positioning of your Aorta into account. There is a higher pressure in your thigh because all the blood is being helped down your leg by gravity. You cannot trust a wrist reading because the veins become very small and there are a lot of them, plus you once again have gravity working against you.

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Q: Why do you prefer upper arm for measuring bp?
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Why you prefer upper arm for measuring bp?

larger veins for a more accurate reading


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