What is the purpose of priming the lines when setting up a hemodialysis circuit?

• A. To remove air, prevent air embolism, and ensure lines are free of contaminants before connection to the patient
• B. To heat the dialysate
• C. To sterilize the dialyzer
• D. To increase blood flow

Answer: (C)

Priming is the step that prepares the dialysis circuit for patient connection by flushing the lines with saline to remove all air and any particulates. Removing air is crucial because air bubbles in the circuit can travel to the patient and cause an air embolism, which is dangerous. Priming also helps confirm that all connections are secure and there are no leaks or contaminants in the tubing before use. Heating the dialysate is handled by the machine after connection, not by priming. The dialyzer is prepared separately and priming itself does not sterilize it. And increasing blood flow is something the machine does once the circuit is connected and running, not during priming.