When preparing to administer an intravenous medication through a client's triple lumen central venous catheter, the nurse observes that there are no continuous intravenous fluids infusing. Which action should the nurse take?

A. Position the client's head facing away from the site: While positioning can help reduce the risk of infection or discomfort, it does not ensure that the catheter is patent or safe for medication administration. B. Aspirate for the presence of a blood return: Confirming blood return verifies that the central venous catheter is patent and correctly positioned in the bloodstream. This is a critical safety step before administering intravenous medications to prevent extravasation or ineffective delivery. C. Prepare a saline flush in a three mL syringe: While flushing the catheter is important for maintaining patency, the nurse must first confirm the catheter is patent by aspirating for blood return before flushing or administering medication. D. Initiate an infusion of 0.9% normal saline solution: Starting a continuous infusion is not necessary solely for medication administration. The priority is confirming patency and safe access, after which flushing and medication administration can proceed.