The nurse is administering sodium polystyrene sulfonate to a client in acute kidney injury (AKI). Which laboratory finding indicates that the medication has been effective? Reference Range: Glucose [74 to 106 mg/dL (4.1 to 5.9 mmol/L)] Hemoglobin [14 to 18 g/dL (140 to 180 g/L)] Potassium 3.5 to 5 mEq/L (3.5 to 5 mmol/L)] Ammonia [10 to 80 μg/dL (6 to 47 μmol/dL)]

A. Serum potassium level of 3.8 mEq/L (3.8 mmol/L): Sodium polystyrene sulfonate is used to treat hyperkalemia by exchanging sodium ions for potassium ions in the intestines, thereby lowering serum potassium levels. A potassium level within the normal range indicates effective treatment. B. Hemoglobin level of 13.5 g/dL (13.5 g/L): Hemoglobin is unrelated to the action of sodium polystyrene sulfonate and does not reflect the medication’s effectiveness in managing potassium levels. C. Serum glucose level of 120 mg/dL (6.7 mmol/L): Glucose levels are unrelated to potassium management and the use of sodium polystyrene sulfonate, so this lab value does not indicate medication effectiveness. D. Serum ammonia level of 30 µg/dL (17.62 μmol/dL): Ammonia levels are not influenced by sodium polystyrene sulfonate and do not provide information regarding potassium control or medication effectiveness.