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HelpTest Code RNAUR Sodium, Random, Urine
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic, 5-mL tube
Specimen Volume: 4 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Useful For
Assessing acid-base balance, water balance, water intoxication, and dehydration
Method Name
Potentiometric, Indirect Ion-Selective Electrode (ISE)
Reporting Name
Sodium, Random, USpecimen Type
UrineSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 14 days |
| Frozen | 30 days | |
| Ambient | 7 days |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Reference Values
No established reference values.
Random urine sodium may be interpreted in conjunction with serum sodium, using both values to calculate fractional excretion of sodium.
The calculation for fractional excretion (FE) of sodium (Na) is
FE(Na)= ([Na(urine)XCreat(serum)]/[Na(serum)XCreat(urine)])X100
Performing Laboratory
MCHS- MankatoTest Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84300
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RNAUR | Sodium, Random, U | 2955-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| RNAUR | Sodium, Random, U | 2955-3 |
Day(s) Performed
Monday through Sunday