Urea Nitrogen, Serum or Plasma

0020023
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Example Reports
Abnormal
Normal

Ordering Recommendation

Screening test to evaluate kidney function.

Mnemonic

BUN

Methodology

Quantitative Spectrophotometry

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation
Collect

Plasma separator tube or serum separator tube.

Specimen Preparation

Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.2 mL)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Specimens containing sodium fluoride.

Remarks
Stability

After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 1 year

Reference Interval

Refer to Report

Interpretive Data



Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

84520

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Components

Component Test Code* Component Chart Name LOINC
0020023 Urea Nitrogen, Serum or Plasma 3094-0
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • urea nitrogen clearance
  • Blood Urea Nitrogen
  • BUN
Urea Nitrogen, Serum or Plasma