What is the recommended action when a gas cylinder's pressure gauge shows zero?

When a gas cylinder's pressure gauge shows zero, the recommended action is to assume it is empty and label it as such. This is correct because relying solely on the gauge reading is critical in ensuring safety and proper management of gas cylinders. A zero reading indicates that the cylinder may not have any usable gas left, and using it under this assumption can lead to dangerous situations, such as running out of gas unexpectedly during a procedure.

Labeling the cylinder as empty is also important for safety and inventory management. It alerts others to the status of the cylinder, preventing any misunderstandings during its use or when handling it. This clear communication is essential in a medical environment where the timely availability of gases can be crucial for patient care.

In contrast, continuing to use the cylinder until it is confirmed empty can result in operational hazards, as it may compromise the efficacy of treatments that depend on a reliable gas supply. Checking connections and retesting, as well as inspecting for leaks, are prudent actions, but they should follow the initial assumption that a zero reading signifies an empty cylinder. Thus, labeling it empty ensures both safety and compliance with standard practice.