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Urea Nitrogen - Blood
MessageMeasurements of urea nitrogen are used in the diagnosis and treatment of certain renal and metabolic disorders. Urea nitrogen makes up approximately 75% of the total nonprotein nitrogen (NPN) fraction of the blood.
Test Code
BUN
Alias/See Also
LAB3000128
BUN
BUN
CPT Codes
84520
Preferred Specimen
2.0 mL serum collected in a gold serum separator tube (SST)
Minimum Volume
0.5 mL serum
Other Acceptable Specimens
2.0 mL serum collected in an orange rapid clot serum separator tube (RCT)
2.0 mL plasma collected in a light green lithium heparin plasma separator tube (PST)
2.0 mL plasma collected in a light green lithium heparin plasma separator tube (PST)
Specimen Stability
Urea Nitrogen is stable in serum or plasma for:
- 24 hours at room temperature (15 - 25oC)
- several days refrigerated (2 - 8oC)
- 2 - 3 months when frozen )<=-20oC)
Methodology
enzymatic
Reference Range
| Sex | Age | Reference Range |
|---|---|---|
| M/F | 0 - 12 years | 4 - 15 mg/dL |
| M/F | 13 - 60 years | 8 - 22 mg/dL |
| M/F | 61 - 150 years | 8 - 23 mg/dL |
Performing Laboratory
Penn Medicine Lancaster General Health
