Final answer:
Keeping both hands above the operating table level is an important practice for scrub nurses, demonstrating their understanding of maintaining a sterile field in the operating room.
Step-by-step explanation:
The action that most effectively demonstrates that a new staff member understands the role of the scrub nurse is keeping both hands above the operating table level. This indicates an awareness of maintaining a sterile field and preventing contamination during surgical procedures.
The scrub nurse plays a crucial role in the operating room including tasks such as verifying with the team the name of the procedure, ensuring needle and sponge counts are complete, correctly labeling specimens, and confirming any issues with equipment. By maintaining this sterile discipline, the scrub nurse supports the safety and efficiency of the surgical procedure.