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Summary RSWS vs. SIADH
| RSWS | SIADH | |
|---|---|---|
| Volume status | Hypovolemic | Normovolemic (or possibly hypervolemic) |
| Serum sodium Concentration | Decreased | Decreased |
| Urine sodium Concentration | Increased | Increased |
| Urine output | Increased | Normal |
| Mechanism | Excess secretion of sodium and water due to tubular necrosis | Water retention due to elevated ADH (vasopressin) secretion from tumor |
