When the doctor/nurse takes blood from you, why do they try to find a vein, not an artery? And also why is this mainly done on the arm as opposed to other parts of the body?
Vein because Arteries are under pressure every time your heart beats. Its much cleaner the to take from a vein, because even when they do bleed they “ooze”, arteries “spurt”. Arm, because it’s convenient for patient and HCP.
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