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Test Code UREA BF Body Fluid Urea Nitrogen

Clinical System Name

Body Fluid Urea Nitrogen


Body Fluid BUN

Sample Requirements

Specimen:  Body Fluid

Container(s): Sterile Screw-Capped Container, Sterile Screw-Capped Tube or Syringe, Gold SST, Red

Preferred Vol: 0.5 mL

Minimum Vol: 0.25 mL body fluid


Note: Note type of body fluid on requisition. Method is affected by hemolysis.


Processing Instructions

Reject due to: Age of Specimen

Spin: Y

Aliquot: Y

Temp: 2-8oC

Storage location: Core 5 Chemistry Refrigerator


Off-site collection: Note type of body fluid on requisition. Spin fluid to separate from cells. Refrigerate 2-8oC.



Specimen Type Temperature Time
Body Fluid RT

24 H

Body Fluid 2-8oC

 5 D

Body Fluid -20oC or -70oC

 180 D



STAT Performed TAT
Y 24/7 1 H


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number: 206-987-2617

Reference Range

Reference ranges are not available for BF.


Method:  Spectrophotometric, Rate methods by Vitros 4600

Analytical Volume:  0.05 mL supernatant

CPT Codes