Fig. 1From: Intractable hyponatremia complicated by a reset osmostat: a case reportEuvolemic hyponatremia characterized by urine concentration. Urine osmolality serves as a surrogate marker for antidiuretic hormone activity in hyponatremic patients. The etiologies of hyponatremia are characterized by urine osmolality that reflects antidiuretic hormone activityBack to article page