Immunofixation - urine

定义

Urine immunofixation is a test to look for abnormal 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 和 rinse well.
• Allow a small amount of urine 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 (30 to 60 milliliters) 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.

婴儿:

• 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 和 attach the adhesive to the skin.
• For females, place the bag over the labia.
• Diaper as usual over the secured bag.

It 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 和 change the bag after the urine has been collected. Drain the urine from the bag into the container given to you by your provider.

Deliver the sample to the lab or your 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 for the presence of certain proteins called monoclonal immunoglobulins. These proteins are linked to 多发性骨髓瘤 和 Waldenström macroglobulinemia. The test is also done with a blood test to check for a monoclonal immunoglobulin in the serum.

正常的结果

Having no monoclonal immunoglobulins in the urine is a normal result.

What Abnormal Results Mean

The presence of monoclonal proteins may indicate:

• Cancers that affect the immune system, such as 多发性骨髓瘤 or Waldenström macroglobulinemia
• 其他癌症

注意事项

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

参考文献

Castillo JJ, Treon SP. Waldenström macroglobulinemia/lymphoplasmacytic lymphoma. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles 和 Practice. 8日艾德. Philadelphia, PA: Elsevier; 2023:chap 92.

McPherson RA, Riley RS, Massey HD. Laboratory evaluation of immunoglobulin function 和 humoral immunity. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis 和 Management by Laboratory Methods. 24日艾德. Philadelphia, PA: Elsevier; 2022:chap 47.

Rajkumar SV, Dispenzieri A. Multiple myeloma 和 related disorders. In: Niederhuber JE, Armitage JO, Kastan MB, Doroshow JH, Tepper JE, eds. Abeloff's Clinical Oncology. 6日艾德. Philadelphia, PA: Elsevier; 2020:chap 101.