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The University of Chicago Medicine Laboratories

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Mayo Clinic Laboratories

Test Code RUN Urine Urea Nitrogen, Random 

Important Note

If ordering a timed collection use order code URUN

Specimen and Container/Tube

Specimen Type: Urine, Random Collection

Preferred Specimen: Sterile Plastic Container

Other Acceptable specimens: Sterile Clean Glass Container

Volume

Preferred Volume: 0.5 mL

Minimum Volume: 0.2 mL

Specimen Stability

Storage Temperature

Stability

Room temperature

 2 days

Refrigerated

7 days

Frozen

1 month

Collection Instructions

  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

  • Collect specimen per standard collection procedure and send to laboratory immediately. 
  • No preservatives or additives.

 

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Samples should be centrifuged within 2 hours of collection
  • No preservatives or additives
  • Centrifuge specimens at >2500 x g for 10 minutes at room temperature.
  • Aliquot urine into plastic tube containing a minimum of 0.2 mL of specimen.
  • Urine samples must then be sent refrigerated at 2-8oC.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are collected with preservatives or additives.

Reference Values

Test

Age

Sex

Reference Range

Urine Urea Nitrogen

All

All

N/A

Critical Values

Not applicable 

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

 

STAT Turnaround Time: 1 hour

Routine Turnaround Time: 4 hours

Testing Schedule: 24/7

Clinical Indications

Assessment of protein intake and/or nitrogen balance. 

Test Components

Urine Urea Nitrogen

Methodology

Spectrophotometric, Kinetic (Roche Diagnostics)

CPT Codes

84540

LOINC Codes

TBD

Synonyms/Keyword Search

Urine Urea Nitrogen, Urine BUN, URUN, RUN

Additional Information

  • Results should always be assessed in conjunction with patient's medical history, clinical examination and other findings.
  • Reference ranges for random urine specimens have not been established; subject to ordering physician interpretation only.

Last Review Date

4/3/2025