The Bence-Jones protein (BJP) test measures the level of BJP in your urine. Bence-Jones proteins are named for Henry Bence-Jones, a physician and chemist who first isolated them in 1847. These proteins are not present in healthy urine samples and are usually a sign of multiple myeloma. Multiple myeloma is a type of bone marrow cancer that is most common in people who are older than 60 years.
Your bone marrow is found in the center of your larger bones. It makes red and white blood cells as well as platelets. Multiple myeloma is a condition where your bone marrow makes too much of a type of white blood cell.
Normally, white blood cells make many different types of antibodies. They play an important role in your immune system. However, when you have multiple myeloma, one white blood cell line grows out of control. It produces only one type of antibody. These cells then crowd out the normal cells. Your body is then vulnerable to illness.
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