is determined by demonstration of a monoclonal immunoglobulin molecule or chain in serum and/or urine. Previous results on immunofixation electrophoresis (IFE) and quantitative free light chain ...

Comparison of serum IFE with serum FLC in a large primary care and tertiary referral hospital showed that 50.7% of subjects with an M-protein demonstrated by IFE had normal κ/λ ratios.