DefinitionA quantitative Bence-Jones protein test measures the specific level of abnormal proteins (Bence-Jones proteins) in your urine.Alternative NamesImmunoglobulin light chains - urine; Urine Bence-Jones proteinHow the test is performedA clean-catch (midstream) urine sample is needed.Men or boys should first wipe clean the head of the penis. Women or girls need to wash the area between the lips of the vagina with soapy water and rinse well.As you start to urinate, allow a small amount to fall into the toilet bowl (this clears the urethra of contaminants). Then, in a clean container, catch about 1 to 2 ounces of urine and remove the container from the urine stream. Give the container to the health care provider or assistant.In infants, thoroughly wash the area around the urethra. Open a