Table 2.

Water deprivation test

Test	Result	Reference range
Antidiuretic hormone	<0.5 ↓	4–14 ng/L
Serum osmolality	297	275–295 mOsm/kg
Urine osmolality	Pretest: 65 ↓ Post-test: 236 (>50% rise)	300–900 mOsm/kg