When collecting a blood specimen using the vacuum tube method of venipuncture,venous reflux is prevented by
A) keeping the patient's arm in a downward position.
B) inserting the needle at a 15-degree angle to the patient's arm.
C) filling the evacuated tube to the exhaustion of the vacuum.
D) removing the tourniquet before withdrawing the needle from the patient's arm.
Correct Answer:
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