Final answer:
The final step for an ECG technician dealing with a patient on contact precautions is to thoroughly wash their hands to prevent potential cross-contamination and ensure all equipment is properly disinfected.
Step-by-step explanation:
The final step the ECG technician should take with a patient on contact precautions is to wash hands. This practice ensures the reduction of potential cross-contamination between patients and health-care workers. Hand hygiene practices are critical in medical settings; specifically, they come into play after the removal of gloves, which is another essential step in preventing the spread of infection.
Additionally, meticulous disinfection of all equipment used is essential to prevent any residual pathogens from transferring to other patients or surfaces.