Final answer:
You should administer oxygen via nasal cannula to a patient who is complaining of chest pain or shortness of breath and has an SpO2 reading below 94%.
Step-by-step explanation:
To follow the protocol that states "O2 via NC prn if symptomatic for CP/SOB and SpO2 < 94%", you should consider oxygen for a patient complaining of chest pain (CP) or shortness of breath (SOB) if the SpO2 is below 94%. Therefore, the correct action is to administer oxygen via a nasal cannula as needed when these symptoms are present, and the pulse oximeter shows an SpO2 reading below the normal range of 95-100 percent saturation. Administering oxygen in this manner helps ensure that the patient's hemoglobin is sufficiently saturated with oxygen, which is vital for cellular function and overall health.