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This question already has an answer here:

Why is blood drawn from veins? Is it because veins have a large lumen? Or is it because the blood is flowing at a lower pressure and makes discharge easier? Is it safer to draw blood from veins?

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marked as duplicate by MattDMo, kmm, Chris Jul 27 '16 at 10:47

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If you draw blood from arteries,it will spout out because the arterial blood flows at some pressure. Moreover, it is too hard to stick a needle because arteries consist of thick blood walls.

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