 The formation of amyloid is due to these free light chains circulating through the body, caused by abnormal clones of plasma cells overproducing monoclonal immunoglobulin lambda light chains.This type usually affects males over the age of 60 and is rapidly progressive.Diagnostic tests includes serum and urine electrophoresis, laboratory testing for the determination of elevated levels of troponin and BNP, and ECGs showing low QRS voltages.