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Labcorp Oklahoma, Inc.
Test Directory


Urea Nitrogen, Blood (BUN)

Order Name BUN
Test Number: 2001100
Revision Date 06/04/2021
Test Name Methodology LOINC Code
Urea Nitrogen, Blood (BUN)
Urease/GLDH 3094-0 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Alternate 1 1 mL (0.5) Serum Clot Activator SST Refrigerated
Instructions Specimen Stability: Ambient 7 days, Refrigerated 7 days, Frozen 1 year
Testing Schedule Daily 
Expected TAT 1-2 days  
Clinical Use Useful in the diagnosis and treatment of certain renal and metabolic disorders. 
CPT Code(s) 84520
Lab Section Chemistry