Laboratory: Clinical Biochemistry
Test Name:
SODIUM - (U)
Test Code: NAU
Clinical Information:
Sodium is the primary extracellular cation and functions to maintain fluid distribution and osmotic pressure. Measurement of urine sodium is important for the assessment of acid-base balance, water balance and dehydration.
Collection Devices:
Collect 24h urine without preservative. Refrigerate 24h and random urine specimens until analysis.
Similar lab approved leak-proof containers acceptable.
Specimen Required:
Urine: 3.0 mL

Stability 7 days refrigerated, 6 months frozen
Referral:
Urine: 3.0 mL

Stability 7 days refrigerated, 6 months frozen
If random urine, specify.
If 24h urine, measure and record volume. Refrigerate 24h and random urine specimens until analysis.
Requisition:
Reference Values:
40 - 200 mmol/d
Availability:
Stat or Routine
See Also:
More Information: