CPT® Code 81264

IGK@ (Immunoglobulin kappa light chain locus) (eg, leukemia and lymphoma, B-cell), gene rearrangement analysis, evaluation to detect abnormal clonal population(s)

The CPT® Code 81264 refers to a specific molecular genetic test that focuses on the immunoglobulin kappa light chain locus (IGK@), which is located on chromosome 2. This test is primarily utilized in the evaluation of certain hematological conditions, particularly leukemia and lymphoma, specifically those involving B-cells. The immunoglobulin kappa light chain plays a crucial role in the immune system by recognizing foreign antigens and initiating an immune response. It is important to note that immunoglobulin light chains are composed of small polypeptide subunits, which can be categorized into two types: kappa, found on chromosome 2, and lambda, located on chromosome 22. The IGK@ gene rearrangement analysis is significant because it allows for the detection of abnormal clonal populations within blood and lymphatic tissues. This is achieved through advanced techniques such as polymerase chain reaction (PCR), which enhances the accuracy of identifying clonal immunoglobulin gene rearrangements compared to other assays, such as those targeting the immunoglobulin heavy chain locus (IGH@). Furthermore, the IGKV configuration is less frequently subjected to somatic hypermutation than the IGHV configuration, making the IGK@ assay a valuable tool in routine clonality analysis, particularly in the diagnosis of lymphatic neoplasms. This testing is essential for clinicians to accurately diagnose and manage conditions related to abnormal clonal populations in hematological malignancies.