Urea Nitrogen Clearance

CPT: 84545
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Test Details

Synonyms

  • Urea Clearance
  • UUN Clearance

Test Includes

Blood urea nitrogen; urine clearance; urine urea nitrogen

Use

Renal function test

Methodology

Enzymatic (urease)

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

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

Clinical Information

Special Instructions

Must be a timed collection.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
002329 Urea Nitrogen Clearance 001040 BUN mg/dL 3094-0
002329 Urea Nitrogen Clearance 135301 Urea Clearance mL/min 3098-1
002329 Urea Nitrogen Clearance 013508 Urea Nitrogen, U mg/dL 12967-6
002329 Urea Nitrogen Clearance 013236 Urea Nitrogen, 24hr g/24 hr 3096-5

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The LOINC® codes are copyright © 1994-2017, 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