Imperial Collage Healthcare

Sodium (urine)


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 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


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