Final answer:
The RN should first recheck the client's BP to confirm the accuracy of the LPN's measurement and assess the client for any signs or symptoms of complications.
Step-by-step explanation:
The RN should first recheck the client's BP. This is important to confirm the accuracy of the LPN's measurement and to ensure that the client's BP is indeed significantly elevated. The act of rechecking the BP will also allow the RN to assess the client for any signs or symptoms of hypertensive crisis or other complications.
If the rechecked BP remains elevated, the RN can then consider other appropriate actions, such as treating the client's BP with a prescribed antihypertensive, asking the LPN to review the technique for obtaining BP, or reviewing the client's medical record for other episodes of elevated BP.