What action should a patient care technician take if a patient receiving oxygen via nasal cannula has a pulse oximetry level of 91%?

Reporting the pulse oximetry level to a nurse is the appropriate action in this situation because it ensures that a licensed healthcare professional is informed about the patient's oxygen saturation status, which is crucial for determining the next steps in patient care. A pulse oximetry level of 91% indicates that the patient may not be receiving adequate oxygenation, as normal levels typically range from 95% to 100%.

When a patient’s level falls below this threshold, it signifies a potential need for intervention. By communicating this information to a nurse, the patient care technician facilitates a timely assessment and intervention, which could include adjusting the oxygen flow, considering a different delivery method, or further evaluations to understand the underlying cause of the low oxygen saturation.

While increasing the oxygen flow might seem like a quick fix, it should only be done under the direction of a healthcare provider to avoid potential complications. Changing to a different delivery method without professional guidance could also be inappropriate, as it requires specific clinical judgment. Waiting to see if the level improves does not address the immediate concern and could place the patient at risk. Thus, reporting to a nurse is the most responsible and clinically sound action in this context.