Pre-Administration Assessment for Rivaroxaban in Renal Impairment

A nurse prepares to administer a new oral anticoagulant medication, Rivaroxaban (Xarelto), to a patient diagnosed with atrial fibrillation. The patient has a history of renal impairment. The drug is prescribed at a dose of 20 mg once daily. Before administering the medication, the nurse should consider the patient's renal function status.

Which of the following actions should the nurse prioritize prior to administering Rivaroxaban to ensure patient safety?