What is Immunofixation Electrophoresis Urine test?

The immunofixation urine test is performed to determine the amount of immunoglobulins in your urine. Immunoglobulins are proteins that your immune system produces to fight against foreign substances - microbes, allergens - or cancer. Presence of any kind of protein in the urine may be an indication of a  health condition.  

The immunofixation urine test looks for a specific abnormal immunoglobulin called the monoclonal or M protein in the urine. These are multiple copies of the same protein made by a single type of plasma cell - a kind of white blood cells. 

The test makes use of an electric current to push the proteins through a special gel (electrophoresis). After this process, the gel is treated to retain the target proteins (immunofixation). With the use of a stain, these different kinds of proteins present in the gel can be seen as bands.

  1. Why is an Immunofixation Electrophoresis Urine test performed?
  2. How do you prepare for an Immunofixation Electrophoresis Urine test?
  3. How is an Immunofixation Electrophoresis Urine test performed?
  4. What do Immunofixation Electrophoresis Urine test results mean?

Your doctor will ask you to get this test done if you have symptoms of one of the following conditions:

Multiple myeloma: It is a cancer of plasma cells that are found in the bone marrow. Symptoms of multiple myeloma include:

Primary amyloidosis: It is a rare disorder in which abnormal proteins (called the amyloid proteins) begin to get accumulated in tissues and organs. Symptoms of primary amyloidosis are:

Waldenstrom’s macroglobulinaemia: It is yet another type of white blood cell cancer that manifests in the form of:

Abnormal immunoglobulins are present in all of these medical conditions. 

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No preparation is needed for this test. However, you must inform your doctor if you are taking any routine medications, herbal supplements or vitamin. 

A 24-hour urine sample is needed for this test. You’ll be provided with a special container to collect the sample. It’s best to start collecting the sample in the morning. 

  • Discard the first urine in the morning and note the time as the beginning of the 24 hour period.
  • For the next 24 hours, collect a sample every time you urinate.
  • The container with the urine must be stored in a cool environment or in a refrigerator.  Label the container with your name and date and time of collection of the sample. 
  • Submit the container to the lab after the 24 hour period. 

If the test is being conducted for an infant, you'll be provided with a urine collection bag to collect the sample. This helps avoid spillage of the sample. Make sure to clean the area around his/her urethra before collecting the sample.

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Normal results:

Normal results indicate the absence of monoclonal immunoglobulins in the urine. In this case, your doctor may perform other tests to determine the cause of the symptoms.

Abnormal results:

Abnormal results indicate that you have abnormal immunoglobulins in your body that could be linked to health conditions such as multiple myeloma and amyloidosis. Your doctor will order more tests to confirm the diagnosis.

It is important to remember that in some individuals, a small number of abnormal immunoglobulins may be present in the body and are not indicative of any health conditions. So, it is important to talk to the doctor to understand your results. 

Disclaimer: All results must be clinically correlated with the patient’s complaints to make a complete and accurate diagnosis. The above information is provided from a purely educational point of view and is in no way a substitute for medical advice by a qualified doctor.

References

  1. University of Rochester Medical Center [Internet]. Rochester (NY): University of Rochester Medical Center; Immunofixation by Electrophoresis (Urine)
  2. National Health Service [internet]. UK; Multiple myeloma
  3. Treon SP, Castillo JJ, Hunter ZR, Merlini G. Waldenstorm: macroglobulinemia/lymphoplasmacytic lymphoma. In: Hoffman R, Benz EJ, Silberstein LE, et al., eds. Haematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier. Chap 87.
  4. McPherson RA, Riley RS, Massey HD, Laboratory Evaluation of Immunoglobulin Function and Hormonal Immunity. In: McPherson RA, Pincus MR, eds. Henry’s Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St. Louis, MO: Elsevier. Chap 46.
  5. University of Rochester Medical Center [Internet]. Rochester (NY): University of Rochester Medical Center; Monoclonal Gammopathies
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