Urea Nitrogen, 24-Hour Urine without Creatinine

Test code

973

CPT code(s)*

84540

Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide Service area information to confirm Test Code for the lab that services your account or to find available tests you can order.

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Clinical significance

Urea Nitrogen, 24-Hour Urine without Creatinine - This quantitative urea nitrogen test, performed with a 24-hour urine specimen, may help estimate nitrogen balance and determine protein need in patients in critical conditions or receiving intravenous administration of nutrition [1].Urea is the main nitrogen-containing product of protein breakdown and makes up over 75% of total nonprotein nitrogen excreted. Approximately 90% of the urea excretion is through the kidneys, and the rest is through gastrointestinal tract and skin. Because urea secretion is closely related to protein catabolism, urinary urea, commonly expressed by the concentration of urinary urea nitrogen, may be used…

Test resources

None found for this test
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Details

Test details

Includes

CPT code 81050 may be added at an additional charge for volume measurement

Methodology

Spectrophotometry (SP)

Alternative name(s)

BUN,Nitrogen Balance,Nitrogen, Urea, 24-Hour Urine

Specimen requirements
Patient preparation	None Specified
Preferred specimen(s)	10 mL urine aliquot from a well-mixed 24-hour collection - no preservative
Alternative specimen(s)	Urine preserved with 6N HCl to maintain a pH of <4. Preserved urine may be shipped at room temperature • Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Minimum volume	2 mL
Collection instructions	Record total volume on both the transport container and the test requisition
Transport container	Plastic urine container
Transport temperature	Refrigerated (cold packs)
Specimen stability	Room temperature (unpreserved): 24 hours (including collection time) Refrigerated: 7 days Frozen: 15 months

Reference range(s)

6-17 g/24 h

LOINC® codes

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Service Area Information

Performing lab & setup schedule

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Service Area Information

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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