After using a portable medical oxygen delivery system, what is the first step to take?

The appropriate action to take after using a portable medical oxygen delivery system is to store it for future use and inspect it regularly. This step is essential for ensuring safety and reliability in future usage. Proper storage prevents accidental damage to the system and keeps it in optimal condition, ready for the next time it is needed. Regular inspections allow the user to identify any potential issues such as leaks or wear that might compromise the system’s effectiveness during subsequent use.

While other options may seem relevant, they do not emphasize the importance of safe storage and ongoing maintenance for emergency readiness. Storing the system properly is critical in ensuring that it is always accessible and functional when needed.