A client's blood pressure reading is 156/94 mm Hg. Which action should the nurse take first?

The correct action for the nurse to take first when a client's blood pressure reading is 156/94 mm Hg is to compare the current reading with the client's previously documented readings. This comparison helps determine whether the current reading is abnormal for the client. Option A, which involves informing the client that the blood pressure is high and comparing it with the previous readings, is appropriate as it educates the client and aids in accurate assessment. Option B, contacting the health care provider for medication, is premature without further assessment. Option C, replacing the cuff with a larger one, is incorrect as it may affect the accuracy of the blood pressure measurement and is not a standard practice for managing high blood pressure readings.