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Test Code NITU Nitrogen, Total, 24 Hour, Urine

Reporting Name

Nitrogen, Total, U

Useful For

Assessing nutritional status (protein malnutrition)

 

Assessment of protein nutrition and nitrogen balance in hospitalized patients

 

Evaluating protein catabolism

 

Determining nitrogen balance, when used in conjunction with 24-hour fecal nitrogen measurement

Method Name

Dumas Combustion

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


Necessary Information


24-Hour volume (in milliliters) is required.



Specimen Required


Supplies: Urine Tubes, 10 mL (T068)

Container/Tube: Plastic, 10-mL urine tube

Specimen Volume: 10 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. No preservative. Refrigerated is the preferred preservation method.

Specimen Stability Information: Frozen 3 years

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


Sky Lakes Medical Center Note:
An entire 24-hour urine collection is also acceptable.
Note: 1. Starting and ending times of collection are required.

2. Follow instructions in Urine Collection in Specimen Collection and Preparation in General Information.


Specimen Minimum Volume

2 mL

Specimen Stability Information

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

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

<16 years: Not established

≥16 years: 4-20 g/24 hours

Day(s) Performed

Friday

CPT Code Information

84999

LOINC Code Information

Test ID Test Order Name Order LOINC Value
NITU Nitrogen, Total, U 2660-9

 

Result ID Test Result Name Result LOINC Value
17418 Nitrogen, Total, U 2660-9
DUR8 Collection Duration 13362-9
TOTV Specimen Volume 28009-9

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

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

No

Diazolidinyl Urea

No

6M Hydrochloric Acid

OK

6M Nitric Acid

No

Sodium Carbonate

OK

Thymol

OK

Toluene

No

 

Report Available

1 to 8 days