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Test Code URUN Urine Urea Nitrogen, Timed

Important Note

If ordering a random collection, use order code RUN. 

Specimen and Container/Tube

Specimen Type: Urine, 24 Hour Timed Collection

Preferred Specimen:  24 Hour Sterile Plastic Container

Other Acceptable specimens: Sterile Clean Glass Container

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
  • Aliquot 10.0 mL of well mixed urine into plastic tube. 
  • 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 Timed

All

All

12000 - 20000 mg/24hr 

Critical Values

Not applicable

CPT Codes

84540

LOINC Codes

TBD

Volume

Preferred Volume: 10.0 mL

Minimum Volume: 1.0 mL

Specimen Stability

Storage Temperature

Stability

Room temperature

2 days

Refrigerated

7 days

Frozen

1 year

Collection Instructions

  • Provide 24-hour urine collection instructions and container to patient.
  • Collect specimen per standard laboratory collection procedures. 
  • No preservatives or additives.
  • Keep 24 hour urine refrigerated during collection process. 

Test Components

Urine collection duration, Urine total volume, Urine urea nitrogen random, Urine urea nitrogen timed 

Clinical Indications

Assessment of protein intake and/or nitrogen balance.

Methodology

Spectrophotometric, Kinetic (Roche Diagnostics)

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

Additional Information

Not applicable

Synonyms/Keyword Search

24 hour urine urea nitrogen

Last Review Date

4/7/2025