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Test Name:
Urea Nitrogen, Serum or Plasma
- SBMF No:
29021 - Performance Lab Name:
Automated Lab - Test Mnemonic:
BUN - ABN:
Not required - CPT Code:
84520 - LOINC Code:
3094-0 - Also Known As:
Blood Urea Nitrogen
BUN - Spec Type:
Serum or plasma - Spec Container:
Gold top (SST), Red top (serum), Light green top (PST), or Green top (lithium heparin) tube - Pref Vol:
1.0 mL - Min Vol:
0.2 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Serum sample tubes, clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum or plasma to separate plastic tube
Properly centrifuged gel barrier tube sample does not require transfer of specimen to separate tube - Spec Store Transport:
Refrigerated - Spec Stability:
1 week refrigerated (2-8°C)
1 year frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Methodology:
Enzymatic - Clinical Significance:
Refer to:
- Reference Range:
8-23 mg/dL - Critical High Value:
≥ 100 mg/dL - Day Run:
Sun-Sat (daily) - Time Run:
As received - Time Reported:
4 hours - Test Type:
CHEMISTRY
