Clinics and Departments

Laboratory Services

Lab Dept

Chemistry

Test Name:

BUN (UREA NITROGEN)

General Information

Lab Order Codes:

BUN

Synonyms:

BUN, Blood Urea Nitrogen; Urea Nitrogen

CPT Codes:

84520 – Urea nitrogen; quantitative

Test Includes:

Urea Nitrogen concentration in mg/dL.

Logistics

Test Indications:

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.

Lab Testing Sections:

Chemistry

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

4 hours

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Preferred: Green top (Li Heparin) tube
Alternate: Red top tube

Draw Volume:

0.6 mL blood

Processed Volume:

0.2 mL plasma/serum

Collection:

Routine venipuncture

Special Processing:

Lab Staff: Centrifuge specimen, remove plasma/serum aliquot into plastic sample cup. Analyze sample immediately or store at refrigerated temperatures.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimen

Interpretive

Reference Range:

Age:

Range (mg/dL):

0 - 2 months:

4 - 15 mg/dL

2 months - 2 years:

5 - 15 mg/dL

2 - 18 years:

9 - 18 mg/dL

>18 years:

8 - 22 mg/dL

Critical Values:

N/A

Limitations:

N/A

Methodology:

Urease

References:

BUN Flex™ reagent cartridge insert sheet, Siemens Healthcare Diagnostics Inc, 2008-03-04 L 717021.001 - US

Clinical Significance, Siemens Healthcare Diagnostics Inc, Newark, Delaware 19714

Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition, 2001

Biorad Liquichek Unassayed Chemistry Control Product Insert (10/2005) Bio-Rad Laboratories, Irvine, CA 92618

Biorad Liquichek Urine Chemistry Control Product Insert (6/2005) Bio-Rad Laboratories, Irvine, CA 92618



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