The nurse is administering sodium polystyrene sulfonate to a client with acute kidney injury (AKI). Which laboratory finding indicates that the medication has been effective?

Serum potassium level of 3.8 mEq/L (3.8 mmol/L)

Hemoglobin level of 13.5 g/dL (135 g/L).

Serum glucose level of 120 mg/dL (6.7 mmol/L)

Serum ammonia level of 30 Mcg/dL (17.62 Mermol/L)