A client with trigeminal neuralgia who is receiving carbamazepine 400 mg orally daily has a white blood cell (WBC) count of 2800 mm3 (28 × 109/L), blood urea nitrogen (BUN) of 17 mg/dL (6.12 mmol/L), sodium of 141 mEq/L (141 mmol/L), and uric acid of 5 mg/dL (0.3 mmol/L). On the basis of these laboratory values, the nurse should make which interpretation? 1.The WBC count is low, indicating a blood dyscrasia. 2.The BUN level is elevated, indicating nephrotoxicity. 3.The sodium level is low, indicating an electrolyte imbalance. 4.The uric acid level is elevated, indicating the risk for renal calculi.

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