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.
When a patient has hyponatremia, the serum osmolality should be tested – if this is high, the hyponatremia is most likely caused by high glucose levels (hyperglycemia). Sodium Correction ...
SIADH is characterized by decreased serum osmolality with inappropriate urinary ... As a result, sodium excretion in the urine increases, resulting in low serum sodium values (Palmer, 2000).
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