A nurse is collecting data from a client who reports feeling short of breath and notes that the client's SaO2 level is 88% while on room air. Which of the following actions should the nurse take first?

D Check the client's medical records to see which medications were recently administered. A Recheck the client's SaO2 level after having the client cough and clear their throat. B Review the client's most recent SaO2 level in the medical record. C Notify the charge nurse of the client's condition.