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BUN
MessageChemistry
Test Code
LAB140
CPT Codes
84520
Preferred Specimen
Light green top tube (lithium heparin plasma)
Minimum Volume
Whole blood: 600 uL ( one full light-green-top microtainer or two full red-top microtainers).
Serum/plasma: 300 uL plasma.
Serum/plasma: 300 uL plasma.
Other Acceptable Specimens
Gold top (serum separator tube) or Red Top
Instructions
Included in Basic Metabolic Panel and Comprehensive Metabolic Panel
LAB: Serum acceptable. Separate specimen within 4 hours of collection.
LAB: Serum acceptable. Separate specimen within 4 hours of collection.
Specimen Stability
Ambient: up to 1 day.
Refrigerated: 5 days.
Frozen: 6 months.
Refrigerated: 5 days.
Frozen: 6 months.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed, contaminated, not enough volume
FDA Status
Approved
Setup Schedule
Everyday
Report Available
Same day
Limitations
Ammonium ions may cause an increase in measured BUN/UREA value equivalent to the specimen’s nitrogen content.
Reference Range
Males: 9-20 mg/dl
Females: 7-17 mg/dl
Females: 7-17 mg/dl
Performing Laboratory
Hoag Newport/ Hoag Irvine
