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HelpTest Code NAU Sodium, 24 Hour, Urine
Reporting Name
Sodium, 24 HR, UUseful For
Assessing acid-base balance, water balance, water intoxication, and dehydration
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineNecessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube: 24-hour graduated urine container with no metal cap or glued insert
Submission Container/Tube: Plastic tube or a clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 5 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Special Instructions
Reference Values
≥18 years: 22-328 mmol/24 hours
Reference values have not been established for patients who are less than 18 years of age.
Test 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 |
|---|---|---|
| NAU | Sodium, 24 HR, U | 2956-1 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| NA_24 | Sodium, 24 HR, U | 2956-1 |
| TM11 | Collection Duration | 13362-9 |
| VL9 | Urine Volume | 3167-4 |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Method Name
Potentiometric, Indirect Ion-Selective Electrode
Day(s) Performed
Monday through Sunday