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Depends on the test. You can be drawn from the arm, the finger poke, a heel stick (usually done for infants), an arterial blood draw (used to measure respiratory gases). Most common, in the average lab, are either the arm poke or the finger poke.
I agree, don't look. It hardly hurts at all. There are things that happen to us everyday that hurt a lot worse and we hardly ever give those things much thought at all.
when you get blood drawn, does it have to be done in the vein of your arm??
As Shy mentioned it does depend on why the test is being done. It is done in the vein of your arm because that is the easiest and least painful vein to draw from.