Days Set Up
Daily, 24 hours
Analytic Time

2 hours

MiChart Code
Urea Nitrogen (BUN)
Soft Order Code
UN

Test Updated:

Synonyms

BUN
UN
Urea, Serum
UREA NITROGEN
UNPR
Urea Nitrogen, Pre-dialysis
UNPO
Urea Nitrogen, Post-dialysis

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Rate (Urease)

Test Usage

Renal function test, evaluate protein metabolism.

Reference Range

1-11 years: 5 - 20 mg/dL (0.8-3.3 mmol/L), 12-150 years: 8 - 20 mg/dL (1.3-3.3 mmol/L).

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect specimen in SST tube. For Pre-Dialysis (UNPR) or Post-Dialysis (UNPO) testing, collect specimen in a green top tube.

Collection Offsite

Collect specimen in SST tube. Centrifuge, aliquot serum into a plastic container and refrigerate.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
84520
Pro Fee Code
 
LOINC
3094-0

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.