Test Code BUN Blood Urea Nitrogen (BUN), Serum
Reporting Name
Bld Urea Nitrog (BUN), SUseful For
Screening test for evaluation of kidney function
Performing Laboratory

Specimen Type
SerumNecessary Information
Patient's age and sex are required.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.
Specimen Minimum Volume
See Specimen Required
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Serum | Refrigerated (preferred) | 7 days | |
Frozen | 365 days |
Reference Values
Males
1-17 years: 7-20 mg/dL
≥18 years: 8-24 mg/dL
Reference values have not been established for patients who are <12 months of age.
Females
1-17 years: 7-20 mg/dL
≥18 years: 6-21 mg/dL
Reference values have not been established for patients who are <12 months of age.
Day(s) Performed
Monday through Sunday
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84520
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
BUN | Bld Urea Nitrog (BUN), S | 3094-0 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
BUN | Bld Urea Nitrog (BUN), S | 3094-0 |
Report Available
Same day/1 to 2 daysReject Due To
Gross hemolysis | OK |
Method Name
Photometric/Urease
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.