A client has been on mechanical ventilation for several days…

A client has been on mechanical ventilation for several days. The client is at risk for the development of respiratory alkalosis. Which arterial blood gas will the nurse identify as indicative of the development of this complication? (Normal value ranges: pH 7.35-7.45, HCO3 21-28 mEq/L, pCO2 35-45 mm Hg)