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Mayo Clinic Laboratories

Test Code NITU Nitrogen, Total, 24 Hour, Urine

Additional Codes

Epic Order Name: NITROGEN, TOTAL-URINE 24 HR (aka NITU)
Sunquest Order Code: NITU
Epic Px Code: LAB6081

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 (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

Specimen Minimum Volume

2 mL

Specimen Stability Information

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

Special Instructions

Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens

Reference Values

<16 years: Not established

≥16 years: 4-20 g/24 hours

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.

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	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

Secondary ID

607705

Day(s) Performed

Friday

Report Available

1 to 8 days

Laboratory Services Directory