You insert the needle in a patients arm and properly engage the tube. No blood flows into the tube. You make subtle needle adjustments and there is still no blood flow. Which of the following is the best thing to do next?
A. discontinue the draw and try somewhere else
B. keep redirecting the needle until you hit a vein
C. lift up on the needle to crease a steeper angle
D. try a new tube in case its a vacuum problem
Answer: D
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