Vanderbilt Pathology Laboratory Services

UREA NITROGEN BLOOD (BUN)

Department: Chemistry
Test Synonym(s): BUN
CPT Codes: 84520
Methodology: Enzymatic Hydrolysis
Reference Range: 5 - 25 mg/dL
Tube Type: Light green PST (Lithium Heparin with gel) tube - 4.5 mL
Specimen: Plasma
Alternate Specimen: Red top tube - 5 mL
Pediatric Requirements: 2 microtainers

Volume: 2 mL plasma

Minimum Volume: 0.5 mL plasma
Temperature: Separate within 1 hour and store/ship @ ambient temperature until delivery.


Stability: < 3 days at 2 - 8ºC; 6 months at -20ºC
Reasons for Rejection: Hemolysis; improper collection

Days Performed: Daily

Times Performed: Continuous

TAT: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab

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