BJP is a paraprotein immunoglobulin free kappa or lambda light chain produced by neoplastic plasma cells. Light chains can be immunoglobulin fragments or single homogenous immunoglobulins. They are found in urine as they are small and hence easily cleared by the kidneys.
|Qualitative test (positive/negative)|
Random urine or 24 hour urine collection
Random urine: 5 mL
or 24 hour urine collection
BJP will not be observed in non-secretory forms of multiple myeloma.