Syndrome of inappropriate antidiuretic hormone laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

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Overview

Serum tests include electrolytes, BUN, creatinine, glucose levels, and osmolality. Patients with syndrome of inappropriate antidiuretic hormone may be characterised with hyponatremia (sodium <135 mEq/L) and low serum osmolality (<280 mOsm/kg).
Urine tests: Patients with syndrome of inappropriate antidiuretic hormone show elevated urinary sodium level (>20 mmol/L) and urine osmolality (generally >100 mOsm/L).