A nurse is caring for a postoperative client and obtains a pulse oximeter reading of 89%. Which of the following interventions should the nurse take first?

A. Notify the primary care provider of the results: Notifying the provider is important for persistent hypoxemia, but the nurse should first ensure the reading is accurate. Immediate action should confirm whether the low saturation reflects true hypoxemia or a measurement error. B. Document the finding in the medical record: Documentation is part of standard care, but it does not address the potential acute hypoxemia. Recording should occur after verifying the reading and initiating appropriate interventions if needed. C. Repeat the test on another finger: Pulse oximeter readings can be affected by poor perfusion, nail polish, cold extremities, or device malfunction. Repeating the test on a different finger or site helps confirm the accuracy of the measurement before taking further clinical actions. D. Consult the respiratory therapist: Referral to a respiratory therapist may be indicated if hypoxemia persists, but it is not the first action. The nurse must first verify the accuracy of the SpO2 reading to determine whether urgent intervention is necessary.