Antibodies are made up of chains of protein : 2 long (heavy) chains and 2 shorter (light) chains. Sometimes pieces of the abnormal myeloma protein are filtered through the kidney into the urine. This urine protein, known as Bence Jones protein, is the part of the antibody called the light chain. The tests used for finding a monoclonal antibody in urine are called urine protein electrophoresis (UPEP) and urine immunofixation. These are done most often on urine that has been collected over a 24-hour period, not just on a routine urine sample.
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