Plasma osmolarity < 280 mOsm/L
Inappropriate urine osmolarity > 150 mOsm/L
Normal extracellular volume: no orthostatic hypotension, tachycardia,
oedema or ascites
Natriuresis > 30 mmol/L on a normosed diet
Normal thyroid and adrenal function
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No recent use of diuretics
No correction of the natremia after infusion of 0.9% saline
Correction of the natremia after water restriction
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