Urea Nitrogen Clearance

TEST: 002329
Test number copied
CPT: 84545
Print Share

Synonyms

  • Urea Clearance
  • UUN Clearance

Test Includes

Blood urea nitrogen; urine clearance; urine urea nitrogen

Special Instructions

Must be a timed collection.

Expected Turnaround Time

Within 1 day

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Related Information

Related Documents

Specimen Requirements

Specimen

Serum and urine (24-hour)

Volume

1 mL serum and 10 mL urine aliquot

Minimum Volume

0.5 mL serum and 1 mL urine aliquot (Note: This volume does not allow for repeat testing.)

Container

Gel-barrier tube or transport tube and plastic urine container

Collection

Serum must be drawn during urine collection. Separate serum from cells within 45 minutes of collection.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Temperature

Period

Room temperature

14 days

Refrigerated

14 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Test Details

Use

Renal function test

Methodology

Enzymatic (urease)

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
002329 Urea Nitrogen Clearance 81232-1 001040 BUN mg/dL 3094-0
002329 Urea Nitrogen Clearance 81232-1 135301 Urea Clearance mL/min 3098-1
002329 Urea Nitrogen Clearance 81232-1 013508 Urea Nitrogen, U mg/dL 3095-7
002329 Urea Nitrogen Clearance 81232-1 013236 Urea Nitrogen, 24hr g/24 hr 3096-5

For Providers

Please login to order a test

Order a Test

© 2021 Laboratory Corporation of America® Holdings and Lexi-Comp Inc. All Rights Reserved.

CPT Statement/Profile Statement

The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf