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Catalog ID NITU Nitrogen, Total, 24 Hour, Urine

Important Note

Order: Ref Misc Referral Lab Test

Comment: Urine Nitrogen

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

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


Necessary Information


24-Hour volume is required.



Specimen Required


Supplies: Urine Tubes, 10 mL (T068)

Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 10 mL

Collection Instructions:

1. Collect urine for 24 hours.

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

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


AUMC Laboratory Catalog Note:

Submit 2 full plain urine tubes to laboratory.

Specimen Minimum Volume

2 mL

Specimen Stability Information

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

Reference Values

<16 years: not established

≥16 years: 4-20 g/24 hours

Day(s) and Time(s) Performed

Tuesday, Friday; 11 a.m.

Test Classification

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

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

Reject Due To

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

Method Name

Dumas Combustion

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

Yes

Refrigerate

Preferred

Frozen

Yes

50% Acetic Acid

Yes

Boric Acid

No

Diazolidinyl Urea

No

6M Hydrochloric Acid

Yes

6M Nitric Acid

No

Sodium Carbonate

Yes

Thymol

Yes

Toluene

No

 

Secondary ID

8586