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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

OK

Refrigerate

Preferred

Frozen

OK

50% Acetic Acid

OK

Boric Acid

OK

Diazolidinyl Urea

OK

6M Hydrochloric Acid

OK

6M Nitric Acid

OK

Sodium Carbonate

No

Thymol

OK

Toluene

No