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    Factor XII assay

    Hageman factor assay

    The factor XII assay is a blood test to measure the activity of factor XII -- one of the substances involved in blood clotting.

    How the Test is Performed

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

    How to Prepare for the Test

    There is no special preparation needed for adults.

    How the Test Will Feel

    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.

    Why the Test is Performed

    Your doctor may order this test if you had abnormal results on the partial thromboplastin time (PTT) blood-clotting test, or if one of your blood relatives was diagnosed with factor XII deficiency.

    Normal Results

    A normal value is 50 - 200% of the laboratory control or reference value.

    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 measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

    What Abnormal Results Mean

    Decreased factor XII activity may indicate:

    • Inherited (congenital) deficiency of factor XII
    • Liver disease

    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 light-headed
    • Hematoma (blood accumulating under the skin)
    • Infection (a slight risk any time the skin is broken)

    Considerations

    People with factor XII deficiency usually do not have excess bleeding. Factor XII does not appear to be needed for clots to form during the normal process of stopping bleeding in your body. However, one of the tests used to measure blood clotting in a test tube does require factor XII.

    References

    Gailani D, Neff AT. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ Jr., Shattil SJ, et al, eds. Hoffman Hematology: Basic Principles and Practice. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008:chap 127.

    Kessler C. Hemorrhagic disorders: Coagulation factor deficiencies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 180.

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          A Closer Look

            Tests for Factor XII assay

            Review Date: 2/28/2011

            Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, 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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            St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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