A portable oxygen cylinder reads 200 psi. What is the most appropriate action?

• A. Continue using the current cylinder.
• B. Check for a leak and service the regulator.
• C. Switch to backup oxygen source.
• D. Replace the oxygen cylinder with a new one.

Answer: (D)

A portable oxygen system must have enough stored pressure to reliably deliver oxygen for the needed duration. A reading of 200 psi means the cylinder is near empty and cannot be depended on to provide a continuous, adequate flow. Replacing it with a new, full cylinder ensures that you have a predictable and sufficient oxygen supply for treatment without the risk of an abrupt interruption.

Continuing to use the near-empty cylinder risks running out mid-care, which is unsafe. Checking for leaks or servicing the regulator is appropriate only if you suspect a regulator issue or a leak, not simply because the pressure is low. Switching to a backup source is good if one is readily available, but the safest, most straightforward course is to replace with a full cylinder to guarantee adequate supply.