24 h urine immunofixation electrophoresis. Monitoring Serial serum free light-chain measurement should be routinely performed in patients with AL amyloidosis and multiple myeloma patients with oligosecretory disease. It should also be done in all patients who have achieved a complete response to treatment to determine whether they have attained a stringent complete response. Other guidelines for the use of serum free light chain measurement in the management of AL amyloidosis, plasmacytoma and the comparison of treatment responses in clinical trials have also been published. Technical and clinical reviews of serum free light-chain measurement have recently been written by Pratt and Jagannath. References External links Serum free light chains at Lab Tests Online Blood tests