What is the correct way to ensure the patency of an implanted port before medication administration?

To ensure the patency of an implanted port before administering medication, checking for blood return is essential. This step confirms that the port is functioning correctly and is properly positioned within the vascular system. When blood returns easily upon aspiration, it indicates that the port is open and that there are no blockages present. This is particularly critical when administering medications, as it ensures that they will flow properly into the bloodstream.

Flush with alcohol is not a suitable method for maintaining patency because alcohol can irritate the vascular lining and does not clear blockages. Applying a dressing is important for infection control and site protection, but it does not provide information about the functionality of the port. Using a smaller syringe may reduce pressure but does not directly verify whether the port is patent or capable of allowing blood flow and medication delivery. Thus, checking for blood return remains the most reliable method to confirm that the implanted port is open and ready for use.