This test measures the level of abnormal proteins called Bence-Jones proteins in the urine.
A clean-catch urine sample is needed. The clean-catch method is used to prevent germs from the penis or vagina from getting into a urine sample. To collect your urine, the health care provider may give you a special clean-catch kit that contains a cleansing solution and sterile wipes. Follow instructions exactly so that the results are accurate.
The sample is sent to the lab. There, one of many methods is used to detect Bence-Jones proteins. One method, called immunoelectrophoresis, is the most accurate.
The test involves only normal urination, and there is no discomfort.
Bence-Jones proteins are a part of regular antibodies called light chains. These proteins are not normally in urine. Sometimes, when your body makes too many antibodies, the level of light chains also rises. Bence-Jones proteins are small enough to be filtered out by the kidneys. The proteins then spill into the urine.
Your provider may order this test:
A normal result means no Bence-Jones proteins are found in your urine.
Bence-Jones proteins are rarely found in urine. If they are, it is usually associated with multiple myeloma.
An abnormal result may also be due to:
There are no risks with this test.
Reviewed By: Richard LoCicero, MD, private practice specializing in hematology and medical oncology, Longstreet Cancer Center, Gainesville, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.