A client with pneumonia is dyspneic, and the nurse positions the client in a high Fowler's position. The oxygen flow rate is 3 L/minute, and the client's pulse oximeter reading is 96%. An hour later the pulse oximeter reading is 88%. Which action should the nurse take first?

A. Collect a specimen for an arterial blood gas (ABG): While ABG provide detailed information on oxygenation and acid-base status, the process takes time and does not provide immediate correction for hypoxemia. The priority is to stabilize the client's oxygen saturation first. B. Report the findings to the healthcare provider: Notifying the provider is important, but immediate nursing interventions to correct the hypoxemia should take precedence. The drop in oxygen saturation needs to be addressed before escalation. C. Evaluate the client’s white blood cell count (WBC): WBC levels help assess infection severity but do not assist with immediate respiratory distress or oxygenation. This is a secondary concern when managing acute hypoxia. D. Increase the flow rate of oxygen administration: A pulse oximetry reading of 88% indicates hypoxemia. The most urgent action is to increase the oxygen flow rate to improve oxygenation. This is a rapid, nurse-initiated intervention that addresses the client’s saturation.