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Lab Dept
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Chemistry
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Test Name:
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BUN (UREA NITROGEN)
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General Information
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Lab Order Codes:
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BUN
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Synonyms:
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BUN, Blood Urea Nitrogen; Urea Nitrogen
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CPT Codes:
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84520 – Urea nitrogen; quantitative
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Test Includes:
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Urea Nitrogen concentration in mg/dL.
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Logistics
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Test Indications:
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BUN levels, usually analyzed with creatinine, are used to evaluate kidney function, evaluate hydration/dehydration status and to monitor patients with kidney failure or those receiving dialysis therapy.
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Lab Testing Sections:
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Chemistry
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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4 hours
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Blood
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Container:
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Preferred: Green top (Li Heparin) tube
Alternate: Red top tube
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Draw Volume:
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0.6 mL blood
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Processed Volume:
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0.2 mL plasma/serum
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Centrifuge specimen, remove plasma/serum aliquot into plastic sample cup. Analyze sample immediately or store at refrigerated temperatures.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimen
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Interpretive
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Reference Range:
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Age:
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Range (mg/dL):
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0 - 2 months:
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4 - 15 mg/dL
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2 months - 2 years:
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5 - 15 mg/dL
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2 - 18 years:
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9 - 18 mg/dL
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>18 years:
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8 - 22 mg/dL
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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Urease
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References:
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BUN Flex™ reagent cartridge insert sheet, Siemens Healthcare Diagnostics Inc, 2008-03-04 L 717021.001 - US
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Clinical Significance, Siemens Healthcare Diagnostics Inc, Newark, Delaware 19714
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Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition, 2001
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Biorad Liquichek Unassayed Chemistry Control Product Insert (10/2005) Bio-Rad Laboratories, Irvine, CA 92618
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Biorad Liquichek Urine Chemistry Control Product Insert (6/2005) Bio-Rad Laboratories, Irvine, CA 92618
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