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BUN

Test Code
BUN


Alias/See Also
Blood Urea Nitrogen, Urea Nitrogen


CPT Codes
84520

Preferred Specimen
Serum Separator (Gold/Yellow) Tube


Minimum Volume
0.5 mL


Other Acceptable Specimens
Lithium Heparin Plasma Separator (Light Green) Tube


Instructions
Separate/spin within 2 hours. 


Transport Temperature
Room Temperature


Specimen Stability
Room Temperature: 5 days
Refrigerated: 7 days
Frozen: 7 days


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis, Icterus, Lipemia


Reference Range
BUN
Age Range  Sex Reference Low Reference High Unit Critical Low Critical High
0 minutes 150 years All 8 25 mg/dL N/A 80


Performing Laboratory
This test is performed at the following locations:
  1. MercyOne Siouxland Medical Laboratory
  2. MercyOne Dakota Dunes Medical Laboratory



Last Updated: September 16, 2022


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.