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    Immunofixation - urine

    Urine immunofixation is a test to look for proteins in urine.


    How the Test is Performed

    You will need to supply a clean-catch (midstream) urine sample.

    • Clean the area around where urine leaves the body. Men or boys should wipe the head of the penis. Women or girls should wash the area between the lips of the vagina with soapy water and rinse well.
    • Allow a small amount to fall into the toilet bowl as you start to urinate. This clears substances that may contaminate the sample. Catch about 1 to 2 ounces of urine in the clean container that you are given.
    • Remove the container from the urine stream.
    • Give the container to the health care provider or assistant.

    For an infant:

    • Thoroughly wash the area where the urine exits the body.
    • Open a urine collection bag (a plastic bag with an adhesive paper on one end).
    • For males, place the entire penis in the bag and attach the adhesive to the skin.
    • For females, place the bag over the labia.
    • Diaper as usual over the secured bag.

    I may take more than one try to get a sample from an infant. An active baby can move the bag, so that the urine goes into the diaper. Check the infant often and change the bag after the urine has been collected. Drain the urine from the bag into the container given to you by your health care provider.

    Deliver the sample to the lab or your health care provider as soon as possible after it is done.

    How to Prepare for the Test

    No special steps are necessary for this test.

    How the Test Will Feel

    The test involves only normal urination. There is no discomfort.

    Why the Test is Performed

    This test is most often used to check the levels of certain proteins (called monoclonal immunoglobulins). These proteins are linked to multiple myeloma and Waldenstrom's macroglobulinemia.

    Normal Results

    No presence of monoclonal immunoglobulins is normal.

    What Abnormal Results Mean

    The presence of monoclonal proteins may indicate:

    • Immune system disorders such as multiple myeloma or Waldenstrom's macroglobulinemia
    • Cancer

    Considerations

    Immunofixation is similar to urine immunoelectrophoresis, but it may give more rapid results.

    References

    McPherson RA, Massey HD. Laboratory Evaluation of Immunoglobulin Function and Humoral Immunity. In: Mcpherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods.22nd ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 46

    McPherson RA and Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods.21st ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 46.

    Hoffman R, Benz Jr. EJ, Shattil SJ, et al., eds. Hematology: Basic Principles and Practice. 4th ed. Philadelphia, Pa: Churchill Livingston; 2005:727-33.

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            Tests for Immunofixation - urine

            Review Date: 1/22/2013

            Reviewed By: Todd Gersten, MD, Hematology/Oncology, Palm Beach Cancer Institute, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

            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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