Used in research settings to detect and quantify kappa immunoglobulin light chains in biological samples. Helps in studying plasma cell disorders such as multiple myeloma, where abnormal levels of free light chains are present. Enables monitoring of disease progression and response to treatment by measuring kappa light chain concentration in serum or urine. Also applied in immunological research to assess B-cell function and immune system activity. Provides a reliable, sensitive method for distinguishing clonal vs. polyclonal light chain production.