Preferred Sample Type
Suitable Specimen Types
Plain Spot Urine 24 Hour Urine PlainSodium (Urine)
Specimen Volume
0.1 mL urineSample Preparation
Usual
Turnaround Time
1 daySample Processing In Laboratory
UsualSample Stability
UsualGeneral Information
Urinary sodium, together with assessment of volume status, is useful in the differential diagnosis of hyponatramia. Urinary sodium levels are also frequently ordered during the workup of acute renal failure with the fractional excretion of sodium used as an important marker in distinguishing pre-renal from post-renal failure.
Notes
Urine sodium can be measured on a 24h urine or a random sample
Reference Range
None given. Interpret in conjunction with serum sodium
Specifications
- EQA Status: NEQAS
- EQAS Scheme: Yes