24-72 hours after setup at PeaceHealth Laboratories’ reference lab
Specimen Collection Details
Random urine in a clean, dry plastic container. Do not add preservatives.
Aliquot from a well-mixed collection. Refrigerate. Indicate ‘random’ on container and requisition.
9 days refrigerated. Unstable ambient or frozen.
1 mL urine
0.5 mL urine
Approximately 50% of multiple myeloma patients excrete free light chains in urine. About half of such patients excrete free light chains only; whereas, the other half excrete free light chains and the corresponding intact immunoglobulin. Light chain excretion is roughly proportional to tumor burden with more advanced disease and can be useful in monitoring therapy.