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    Coccidioides complement fixation

    Coccidioides antibody test

    Coccidioides complement fixation is a blood test that looks for antibodies to the fungus Coccidioides immitis. This fungus causes the disease coccidioidomycosis.

    How the Test is Performed

    A blood sample is needed. For information on how this is done, see: Venipuncture

    The blood sample is sent to a lab. The health care provider looks at the clear liquid part of the blood, called serum, to see if there are antibodies to Coccidioides immitis.

    How to Prepare for the Test

    There is no special preparation for the test.

    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

    This test is used to detect infection with the fungus that causes coccidioidomycosis. This condition can cause lung or widespread (disseminated) infection.

    Normal Results

    A normal result means no Coccidioides immitis antibodies are detected in the blood sample.

    Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

    What Abnormal Results Mean

    Abnormal results mean that Coccidioides immitis antibodies are present. This can mean that you have a current or past infection.

    The test may be repeated after several weeks to detect a rise in titer (antibody concentration), which confirms an active infection.

    In general, the worse the infection, the higher the titer, except in people with a weakened immune system.

    There can be false positive tests in patients with other fungal diseases such as histoplasmosis and blastomycosis, and false negative tests in people with single lung masses from coccidioidomycosis.

    Risks

    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 associated with having blood drawn are slight but may include:

    • Excessive bleeding
    • Fainting or feeling lightheaded
    • Hematoma (blood accumulating under the skin)
    • Infection (a slight risk any time the skin is broken)

    References

    Galgiani JN. Coccidioides species. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 266.

    Galgiani JN. Coccidioidomycosis. In: Goldman L, Ausiello D, eds. Cecil Medicine. Philadelphia, Pa: Saunders Elsevier; 2007:chap 354.

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    • Blood test

      illustration

      • Blood test

        illustration

      Tests for Coccidioides complement fixation

      Review Date: 8/24/2011

      Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and 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. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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