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BUN (Blood Urea Nitrogen)

Test Code



Testing performed on Beckman Coulter DxC 700 AU analyzing serum.

Test Utility

Used in the diagnosis and treatment of kidney disease, urinary tract obstruction, and acute or chronic renal failure.

Specimen Storage and Stability

If the analysis is delayed, the sample should be refrigerated or frozen. Stability has been reported to be 24 hours at room temperature (15-25C), several days at 2-8C, and 2 to 3 months when frozen at -20C or colder.

Specimen Collection and Preparation

Allow SST specimens (Gold Top or Tiger, minimum 2.0mL) to clot 30 to 60 minutes then immediately centrifuge to separate serum from cells. Refrigerate (2-8C or 36-46F).

Specimen Rejection

  • Improperly labeled

  • Specimen grossly

  • Hemolyzed uncentrifuged

Reference Ranges

7 - 25mg/dL


Monday - Saturday, 16 hours a day.

Result available after getting the specimen in 5 hours.

STAT results available within 2 hours of receipt in the Laboratory.


Vibra Health Laboratory

Phone: (248) 846-0663

1307 Allen Dr, Suite A, Troy, MI 48083

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