The LymphoTrack Dx IGK Assay for the Illumina MiSeq is an in vitro diagnostic product intended for next-generation sequencing (NGS) based determination of the frequency distribution of IGK gene rearrangements in patients suspected with having lymphoproliferative disease. This assay aids in the identification of lymphoproliferative disorders. The assay represents a significant improvement over existing clonality assays using fragment analysis as it efficiently detects the majority of IGK gene rearrangements using a single multiplex master mix and, at the same time, identifies the DNA sequence specific for each clonal gene rearrangement.