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Urea Nitrogen Clearance

CPT: 84545
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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


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 12967-6
002329 Urea Nitrogen Clearance 81232-1 013236 Urea Nitrogen, 24hr g/24 hr 3096-5

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