Medicine All of the following statements about SIADH are true except: A Serum sodium is low, typically < 135 meq/1 B Urinary sodium excretion is low / normal C Water loading test may be used D Vaptans are new FDA approved agents for treatment of SIADH 💡 Explanation All of the following statements about SIADH are true except: ✓ Correct Answer: B. Urinary sodium excretion is low / normal