To draw blood from a patient with an open IV line, the selected site should be located above the IV to ensure correct blood flow direction.
The selected site to draw blood from a patient with an open IV line should be located: Above the IV. This is to ensure that the blood is drawn in the correct direction, opposite to the flow of the IV fluids. The antecubital fossa is a common and suitable site for drawing blood as it contains important veins like the median cubital vein.
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