If the pressure gauge of an oxygen cylinder regulator shows 100 PSI after opening the valve, what is the best action?

When the pressure gauge of an oxygen cylinder regulator shows 100 PSI after the valve is opened, the best action is to replace the cylinder. This reading indicates that the cylinder has a very low amount of oxygen remaining, as typical full oxygen cylinders are usually above 1,800 PSI when fully filled. A reading of 100 PSI suggests that the cylinder is nearly empty and may not be sufficient for use in an emergency or therapeutic situation.

Administering oxygen requires a reliable and adequate supply to effectively support a patient's needs, especially in critical care settings. Replacing the cylinder ensures that you have a fully charged and functional source of oxygen available for use, which is essential for patient care. Other actions, such as closing the flow controller or replacing the valve or pressure gauge, do not address the underlying issue of having insufficient oxygen supply for effective treatment.