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	up to 1 year (not preferred)

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 2-8^oC.

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

Clinical Indications

Assessment of protein intake and/or nitrogen balance.

Test Components

Urine Urea Nitrogen

Methodology

Spectrophotometric, Kinetic (Roche Diagnostics)

CPT Codes

84540

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

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

LOINC Codes

TBD

Collection Instructions

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

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