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Sodium (urine)

Category Biochemistry
Test background
Clinical Indications

Urine electrolytes assays are typically employed to resolve in-patient hyponatraemia diagnoses. A urinary sodium <20 mmol/L is consistent with a dehydrated patient with functional renal tubules who will respond to rehydration, while a urinary sodium >20 mmol/L (typically >50 mmol/L), in conjunction with a low/normal urea and/or urate, may be indicative of SIADH.

Reference range

No reference range

Sample & container required Random urine (preferred) or 24 hour urine collection
Sample volume Random urine: 0.5 mL or 24 hour urine collection
Turnaround time Random urine: 1 day 24 hour urine collection: 2 days