The charge nurse has stated a client has hyperkalemia and needs cardiac monitoring. The nurse noted which of following lab values?

A. Sodium 148: This represents mild hypernatremia, but sodium levels are not the primary concern for cardiac monitoring. B. Potassium 3.1: This is hypokalemia (low potassium), not hyperkalemia. C. Sodium 130: This represents hyponatremia, which can cause neurological symptoms, not hyperkalemia. D. Potassium 5.7: Hyperkalemia is defined as K⁺ >5.0 mEq/L. Levels above 5.5 can cause dangerous cardiac dysrhythmias, requiring ECG monitoring.