The nurse assesses a client postoperatively who has an arterial line in the right radial artery. Assessment findings include pallor, paresthesia, and slow capillary refill in the client's right-hand fingers. Which action should the nurse take?

A. Perform the Allen test. The Allen test is performed before inserting a radial arterial line to assess ulnar artery patency and ensure adequate collateral circulation. Since the arterial line is already placed and the client is showing signs of compromised circulation (pallor, paresthesia, and slow capillary refill), immediate intervention is required rather than further pre-insertion testing. B. Elevate the client's right arm. Elevating the arm does not directly resolve arterial compromise and may further reduce perfusion by impairing arterial blood flow. The priority is to assess and address potential ischemia caused by arterial line complications. C. Flush the line with heparinized saline. Flushing an arterial line is appropriate for maintaining patency, but in this case, it may worsen ischemia if the catheter is causing an obstruction or arterial spasm. Additionally, flushing should never be done forcefully due to the risk of embolization. D. Notify the healthcare provider. The pallor, paresthesia, and delayed capillary refill suggest arterial insufficiency, possible thrombosis, or arterial spasm, which can lead to tissue ischemia and necrosis if not addressed promptly. The healthcare provider should be notified immediately to assess the need for interventions such as removal of the arterial line, vascular assessment, or anticoagulation therapy.