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 Field Name  Data Description
Test Name  Urea Nitrogen Clearance
Code  Urea Nitrogen Clearance 24H Urine.
CPT Code  84545
Last Modified  6/5/2018 9:10:00 AM
Test Name  U24 Ur Clr.
Synonyms  Urea Clearance, UUN clearance, Urea C,
Patient Preparation  
Spec. Requirements  Blood AND Urine (24 Hour)
Tube  Gold AND 24 hour plastic urine container
Collection Volume  3.5 mL Gold AND Total of 24 hour urine
Storage  Frozen, Refrigerated, or Ambient 14 Days
Routine TAT  
Days Test Performed  
Performed by BHS  None
See Availability  
Reference Lab  LabCorp of America
Reference Lab Code  002329 Urea Nitrogen Clearance
Clinical Use  Renal function test
Reference Range  
Critical Value  
Testing Sample Type  Serum AND Urine
Min Lab Testing Volume  1.0 mL serum AND 10.0 mL urine aliquot
Special Handling  Must be a timed collection
Lab Notes  Collection: Serum must be drawn during urine collection. Separated serum from cells within 45 minutes of collection Test includes:Blood urea nitrogen; urine clearance; urine urea nitrogen
Methodology  Enzymatic (urease)

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