Used in biomedical research to detect and quantify human immunoglobulin free light chains (kappa and lambda) in serum or plasma samples. Helps in the assessment of immune system disorders, particularly in monitoring conditions like multiple myeloma, Waldenström's macroglobulinemia, and other B-cell proliferative diseases. The kit enables accurate measurement of kappa/lambda ratios, aiding in the identification of clonal plasma cell populations. Commonly used in clinical laboratories and research settings for diagnostic support and disease progression tracking.