Of course, the more secure and convenient vessel should be chosen.
The elbow's median vein is used for blood donation. This is because veins are generally located on the surface of the body, with slower blood flow, making them easier to draw blood from. Arteries, on the other hand, are typically located deeper in the dermis, making them more difficult to locate, and their faster blood flow makes it harder to stop the bleeding after blood is drawn.
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