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Test ID URAU Urea, 24 Hour, Urine

Useful For

Assessment of protein intake and/or nitrogen balance

Method Name

Kinetic UV Assay 

Reporting Name

Urea, U

Specimen Type

Urine


Necessary Information


24-Hour volume is required.



Specimen Required


Container/Tube: Plastic, 5-mL tube (T465)

Specimen Volume: 4 mL

Collection Instructions:

1. Add 10 g of boric acid as preservative at start of collection. (If boric acid is not available, refrigerate specimen during collection.)

2. Collect urine for 24 hours.

3. Mix well before taking aliquot.

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

Reference Values

10-35 g/24 hours

Day(s) and Time(s) Performed

Monday through Sunday; Continuously  

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

84540

LOINC Code Information

Test ID Test Order Name Order LOINC Value
URAU Urea, U 48999-7

 

Result ID Test Result Name Result LOINC Value
UREA Urea, U 48999-7
TM33 Collection Duration 13362-9
VL31 Urine Volume 3167-4
URECN Urea Concentration 63481-6

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

No

Refrigerate

Yes

Frozen

Yes

50% Acetic Acid

Yes

Boric Acid

Preferred

Diazolidinyl Urea

Yes

6M Hydrochloric Acid

Yes

6M Nitric Acid

Yes

Sodium Carbonate

Yes

Thymol

Yes

Toluene

No

 

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.