Urea Nitrogen U24

Message

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

Test Code

24UUN

Alias/See Also

70196;
BUN (24 hr Urine);
Urea Nit Ur

CPT Codes
84540

Preferred Specimen

24 hour urine specimen. No preservative necessary

Instructions

Transport 24 urine container in sealed plastic bag

Transport Container

24-HR. Urine Collection Container

Transport Temperature

Refrigerated

Specimen Stability

Room Temperature = 2 days
Refrigerated = 7 days
Frozen = 1 month

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Incorrect specimen type, insufficient sample volume, improper storage conditions, exceeds specimen stability guidelines, contaminated sample.

Methodology
Spectrophotometric

Setup Schedule

24/7
AU

Report Available

daily

Clinical Significance

About 80% of urinary nitrogen is in the form of urea which is the major end product of protein metabolism. Urea excreted in the urine is the primary method of nitrogen elimination; therefore, this test provides an approximate evaluation of nitrogen balance. Conditions associated with increased urine urea nitrogen are hyperthyroidism, high protein diets and post-operative states. Decreased levels are associated with convalescence, liver disease, toxemia and advanced renal disease.

Performing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, OH 45439

Last Updated: November 23, 2021

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.