A 58-year-old man with small-cell lung cancer presents with hyponatremia (Na+ 118 mEq/L). Urine osmolality is 450 mOsm/kg and urine sodium is 65 mEq/L. Another patient with cirrhosis and ascites has hyponatremia (Na+ 120 mEq/L), urine osmolality 280 mOsm/kg, and urine sodium 15 mEq/L. Which feature best distinguishes SIADH from hyponatremia due to cirrhosis?

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