Hyponatremia alone is not a reliable diagnostic ... Serum osmolality, electrolytes, and uric acid, along with urine osmolality and electrolytes, are useful in distinguishing CSW from SIADH.

Hyponatremia is a common phenomenon seen in patients after aneurysmal SAH. Although there is no definitive cause to date, it is frequently thought to be the result of SIADH, CSW, or a combination ...