After inserting the needle into the injection port of an IV line, but before administering the medication, you should:
A. flush the line with a 20 mL bolus of normal saline.
B. withdraw on the plunger of the syringe to detect blood.
C. pinch off the tubing proximal to the injection port.
D. explain the procedure to the patient and obtain consent.
Answer: C. pinch off the tubing proximal to the injection port.
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