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Blood Urea Nitrogen
Test CodeBUN
Alias/See Also
BUN
CPT Codes
84520
Preferred Specimen
Preferred: 1.0 mL of whole blood (0.5 mL of serum/plasma)
Minimum Volume
0.4 mL of whole blood (0.2 mL of serum/plasma)
Instructions
Separate serum from cells within 4 hours
Transport Container
Serum separator (gold top) or for inpatients/MSTI/ED only lithium heparin (green or mint top), EDTA plasma
Transport Temperature
Room Temperature
Specimen Stability
Room Temperature: 24 hours
Refrigerated: 5 days
Frozen: 6 months at -18 degrees C
Refrigerated: 5 days
Frozen: 6 months at -18 degrees C
Methodology
Colorimetric
Setup Schedule
Daily
Report Available
Inpatient turn around time: Routine 3 hours, stat 30 minutes. Outpatient specimens received by noon will be reported by 4:30 p.m. Specimens received after noon will be reported by the next morning.
