Christie Clinic - Medicine for Your Life

Our website is currently having technical difficulties. To view the site, please click here

Health Encyclopedia

Health Encyclopedia

An invaluable resource of health information.

BUN

BUN stands for blood urea nitrogen. Urea nitrogen is what forms when protein breaks down.

A test can be done to measure the amount of urea nitrogen in the blood.

  • Alternative Names

    Blood urea nitrogen

  • How the test is performed

    Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

    Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.

    Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.

    In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.

  • How to prepare for the test

    Many drugs affect BUN levels. Before having this test, make sure the health care provider knows which medications you are taking.

    Drugs that can increase BUN measurements include:

    • Allopurinol
    • Aminoglycosides
    • Amphotericin B
    • Aspirin (high doses)
    • Bacitracin
    • Carbamazepine
    • Cephalosporins
    • Chloral hydrate
    • Cisplatin
    • Colistin
    • Furosemide
    • Gentamicin
    • Guanethidine
    • Indomethacin
    • Methicillin
    • Methotrexate
    • Methyldopa
    • Neomycin
    • Penicillamine
    • Polymyxin B
    • Probenecid
    • Propranolol
    • Rifampin
    • Spironolactone
    • Tetracyclines
    • Thiazide diuretics
    • Triamterene
    • Vancomycin

    Drugs that can decrease BUN measurements include:

    • Chloramphenicol
    • Streptomycin
  • How the test will feel

    When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

  • Why the test is performed

    The BUN test is often done to check kidney function.

  • Normal Values

    7 - 20 mg/dL. Note that normal values may vary among different laboratories.

  • What abnormal results mean

    Higher-than-normal levels may be due to:

    Lower-than-normal levels may be due to:

    • Liver failure
    • Low protein diet
    • Malnutrition
    • Over-hydration

    Additional conditions under which the test may be done include:

  • What the risks are

    Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

    Other risks are slight but may include:

    • Excessive bleeding
    • Fainting or feeling light-headed
    • Hematoma (blood accumulating under the skin)
    • Infection (a slight risk any time the skin is broken)
  • Special considerations

    For people with liver disease, the BUN level may be low even if the kidneys are normal.

  • References

    Molitoris BA. Acute kidney injury. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 121.

Review Date: 5/13/2009

Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
adam.com
Christie Clinic Christie Clinic on University Photo Christie Clinic on University
101 West University Avenue Champaign, IL 61820 Main Phone: (217) 366-1200
Billing Services: (217) 366-1382
Toll Free: (888) 391-0412
Christie Clinic Christie Clinic on Windsor/Convenient Care Photo Christie Clinic on Windsor/Convenient Care
1801 West Windsor Road Champaign, IL 61822 (217) 366-8000
Christie Clinic Christie Clinic at Presence Covenant Photo Christie Clinic at Presence Covenant
1400 West Park Street Urbana, IL 61801 (217) 366-1200
Christie Clinic Christie Clinic in Rantoul Photo Christie Clinic in Rantoul
209 West Borman Drive Rantoul, IL 61866 (217) 892-9671
Christie Clinic Christie Clinic in Mahomet/Convenient Care Photo Christie Clinic in Mahomet/Convenient Care
1001 Commercial Drive Mahomet, IL 61853 (217) 586-6600 or (217)366-8130
Christie Clinic Christie Clinic in Danville on Vermilion/Convenient Care Photo Christie Clinic in Danville on Vermilion/Convenient Care
3545 North Vermilion Street Danville, IL 61832 (217) 442-8611
Christie Clinic Christie Clinic in Tuscola Photo Christie Clinic in Tuscola
300 North Main Street Tuscola, IL 61953 (217) 253-9258
Christie Clinic CU Sleep Photo CU Sleep
1207 South Mattis Avenue Champaign, IL 61821 (217) 355-1684
Christie Clinic Christie Clinic Cancer Center Photo Christie Clinic Cancer Center
109 West University Avenue Champaign, IL 61820 (217) 366-5180
Christie Clinic Convenient Care in County Market (Kirby & Duncan) Photo Convenient Care in County Market (Kirby & Duncan)
2901 West Kirby Avenue Champaign, IL 61821 (217) 366-8130
Christie Clinic Christie Clinic in Urbana/Convenient Care Photo Christie Clinic in Urbana/Convenient Care
1710 East Windsor Road Urbana, IL 61802 (217) 344-9440
Christie Clinic Christie Clinic in Danville on Logan Photo Christie Clinic in Danville on Logan
800 North Logan Avenue Danville, IL 61832 (217) 431-8930
Christie Clinic Christie Clinic on Fox Drive Photo Christie Clinic on Fox Drive
2110 Fox Drive, Suite B Champaign, IL 61820
Christie Clinic Kirby Medical Group Specialty Clinic in Monticello Photo Kirby Medical Group Specialty Clinic in Monticello
1109 A. North State Street Monticello, IL 61856 (217) 366-1304
Gibson Area Hospital
1120 N Melvin Gibson City, IL 60936 (217) 784-2240
Christie Clinic Christie Clinic in Mattoon Photo Christie Clinic in Mattoon
105 B Professional Plaza Mattoon, IL 61938 (217) 345-3000
Christie Clinic Sarah Bush Lincoln Health System Photo Sarah Bush Lincoln Health System
1000 Health Center Drive Mattoon, IL 61938 (217) 258-2588
Christie Clinic The Champaign SurgiCenter Photo The Champaign SurgiCenter
1702 S. Mattis Avenue Champaign, IL 61821 (217) 326-2030
Christie Clinic The Carle Foundation Hospital Photo The Carle Foundation Hospital
611 West Park Street Urbana, IL 61801 (217) 383-3311
Iroquois Memorial Hospital
200 E. Fairman Ave. Watseka, IL 60970 (815) 432-5841
Christie Clinic Christie Clinic at Savoy Photo Christie Clinic at Savoy
501 North Dunlap Avenue Savoy, IL 61874 Transformations: (217) 366-7460 Internal Medicine: (217) 366-5434 Ophthalmology: (217) 366-1250
Christie Clinic at 410 E. University
410 E. University Champaign, IL 61820
Christie Clinic on West Park Street
1405 West Park Street Urbana, IL 61801 217-366-1237
Christie Clinic in Monticello
107 West Main Street Monticello, IL 61856 217.762.3352