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 glucose level of 120 mg/dL (6.7 mmol/L): While this glucose level is slightly above the normal reference range, it is not indicative of the effectiveness of sodium polystyrene sulfonate. The medication's primary purpose is to lower potassium levels, not to manage glucose levels. B) Serum ammonia level of 30 μg/dL (17.62 μmol/dL): Although this ammonia level falls within the normal range, it is not directly related to the action of sodium polystyrene sulfonate. This medication primarily addresses hyperkalemia, so ammonia levels do not reflect its effectiveness. C) Serum potassium level of 3.8 mEq/L (3.8 mmol/L): This potassium level is within the normal reference range, indicating that sodium polystyrene sulfonate has effectively reduced the client’s hyperkalemia. The primary action of the medication is to decrease elevated potassium levels, making this finding the most relevant indicator of therapeutic success. D) Hemoglobin level of 13.5 g/dL (135 g/L): This hemoglobin level is within the normal range but does not provide information about potassium levels or the effectiveness of sodium polystyrene sulfonate. The focus should be on potassium management, making this finding less relevant in this context.