CPT® Code 81340

TRB@ (T cell antigen receptor, beta) (eg, leukemia and lymphoma), gene rearrangement analysis to detect abnormal clonal population(s); using amplification methodology (eg, polymerase chain reaction)

The CPT® Code 81340 refers to a specific molecular genetic test that analyzes the T cell antigen receptor, beta (TRB@) gene, which is located on chromosome 7. This test is particularly significant in the context of certain hematological malignancies, such as leukemia and lymphoma. The T cell antigen receptor plays a crucial role in the immune system, as it enables T cells to recognize and respond to foreign antigens presented by major histocompatibility complex (MHC) molecules on antigen presenting cells (APC). The structure of T cell antigen receptors is complex, consisting of various gene segments that form a configuration akin to immunoglobulin genes. The TRB@ gene rearrangement analysis performed under this code is designed to detect abnormal clonal populations of T cells, which can indicate the presence of malignancies. This analysis employs amplification methodologies, such as polymerase chain reaction (PCR), to enhance the detection of specific DNA sequences associated with the TRB@ gene. PCR is a powerful technique that allows for the selective amplification of target DNA, enabling the identification of mutations or rearrangements that may contribute to the development of cancer. By utilizing this testing method, healthcare professionals can gain insights into the genetic alterations present in T cells, which can inform diagnosis and treatment strategies for patients with blood cancers. The ability to identify and characterize these clonal populations is essential for understanding the underlying mechanisms of disease and for guiding therapeutic decisions.