Sign in →

Test Code URAU Urea, 24 Hour, 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.


Useful For

Assessment of protein intake and/or nitrogen balance

Method Name

Kinetic UV Assay 

Reporting Name

Urea, U

Specimen Type

Urine

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

Day(s) and Time(s) Performed

Monday through Sunday; Continuously  

Analytic Time

Same day/1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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

Ambient:

No

Refrigerated:

Yes

Frozen:

Yes

6N HCl:

Yes

50% Acetic Acid:

Yes

Na2CO3:

Yes

Toluene:

Yes

6N HNO3:

Yes

Boric Acid:

Preferred

Thymol:

Yes