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 |