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Test ID NAU Sodium, 24 Hour, Urine

Useful For

Assessing acid-base balance, water balance, water intoxication, and dehydration

Method Name

Potentiometric, Indirect Ion-Selective Electrode

Reporting Name

Sodium, U

Specimen Type

Urine


Necessary Information


24-Hour volume is required.



Specimen Required


Supplies: Aliquot Tube, 5 mL (T465)

Container/Tube: Plastic, 5-mL urine tube

Specimen Volume: 5 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. Add 25 mL of 50% acetic acid as preservative at start of collection.

Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens in Special Instructions for multiple collections.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  7 days

Reference Values

41-227 mmol/24 hours

Day(s) and Time(s) Performed

Monday through Sunday continuously

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

84300

LOINC Code Information

Test ID Test Order Name Order LOINC Value
NAU Sodium, 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
NACN Sodium Concentration 21525-1

Test Classification

This test has been cleared or approved by the U.S. 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.

NY State Approved

Yes

Urine Preservative Collection Options

Note: The addition of preservative or application of temperature controls must occur within 4 hours of completion of the collection.

Ambient

Yes

Refrigerate

Preferred

Frozen

Yes

50% Acetic Acid

Yes

Boric Acid

Yes

Diazolidinyl Urea

Yes

6M Hydrochloric Acid

Yes

6M Nitric Acid

Yes

Sodium Carbonate

No

Thymol

Yes

Toluene

No