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HelpTest ID NAU Sodium, 24 Hour, Urine
Useful For
Assessing acid-base balance, water balance, water intoxication, and dehydration
Special Instructions
Method Name
Potentiometric, Indirect Ion-Selective Electrode
Reporting Name
Sodium, 24 HR, USpecimen 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 |
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.
Day(s) Performed
Monday through Sunday
Performing Laboratory
Mayo Clinic Laboratories in Rochester
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 |