Medicine The syndrome of inappropriate antidiuretic hormone is characterized by the following A Hyponatremia and urine sodium excretion > 20 meq/1. B Hyponatremia and urine sodium excretion < 20 meq/1. C Hyponatremia and hyperkalemia D Hyponatremia and hypokalemia 💡 Explanation The syndrome of inappropriate antidiuretic hormone is characterized by the following ✓ Correct Answer: A. Hyponatremia and urine sodium excretion > 20 meq/1.