Serum Potassium Level Monitoring

A patient is being monitored for potential electrolyte imbalances. The healthcare provider has ordered a serum potassium level to be checked. Normal potassium levels in adults typically range from 3.5 mEq/L to 5.0 mEq/L. The patient's laboratory results indicate a potassium level of ____ mEq/L. What should be the nurse's primary concern regarding hyperkalemia if the patient's level is above the normal range?