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    Myoglobin - blood

    Serum myoglobin

    Blood (serum) myoglobin is a test that measures the amount of myoglobin in the blood.

    Myoglobin is a protein in heart and skeletal muscles. When you exercise, your muscles use up any available oxygen. Myoglobin has oxygen attached to it, which provides extra oxygen for the muscles to keep at a high level of activity for a longer period of time.

    When muscle is damaged, myoglobin is released into the bloodstream. The kidneys help remove myoglobin from the body into the urine. In large amounts, myoglobin can damage the kidneys.

    Myoglobin may also be measured with a urine test.

    A blood sample is needed. This may be taken from a vein. The procedure is called a venipuncture.

    There is no special preparation.

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

    Serum myoglobin levels may be obtained to confirm suspected muscle damage, including heart and skeletal muscle damage.

    A normal(negative) result is0 - 85 nanograms per milliliter (ng/mL).

    Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

    The examples above show the common results for these tests. Some laboratories use different measurements or may test different samples.

    Greater-than-normal levels are called a positive result. This may be due to:

    • Heart attack
    • Malignant hyperthermia (very rare)
    • Muscular dystrophy
    • Rhabdomyolysis
    • Skeletal muscle inflammation (myositis)
    • Skeletal muscle ischemia (oxygen deficiency)
    • Skeletal muscle trauma

    Risks

    There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

    Other risks associated with having blood drawn 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)

    References

    Chinnery PF. Muscle diseases. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 429.

    O'Connor FG, Deuster PA. Rhabdomyolysis. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 115.

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                Tests for Myoglobin - blood

                Review Date: 2/2/2013

                Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.

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