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Test Code 0207241 Urea, 24 Hour, Urine

Additional Codes

Mayo Test ID
URAU

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Assessment of protein intake and/or nitrogen balance

Method Name

Kinetic UV Assay 

Reporting Name

Urea, U

Specimen Type

Urine


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:

1. 24-Hour volume is required.

2. 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
Urine Refrigerated (preferred) 14 days
  Frozen  14 days

Reject Due To

Hemolysis

NA

Lipemia

NA

Icterus

NA

Other

NA

 

Reference Values

10-35 g/24 hours

Interpretation

Because multiple factors (glomerular filtration rate, dietary protein intake, protein catabolic rate, hydration state, etc.) can independently affect the urinary excretion of urea, all of these factors must be taken into account when interpreting the results.

Day(s) and Time(s) Performed

Monday through Sunday; Continuously  

Analytic Time

Same day/1 day

Specimen Retention Time

7 days

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.

CPT Code Information

84540

LOINC Code Information

Test ID Test Order Name Order LOINC Value
URAU Urea, U In Process

 

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

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