CPT® Code 86833

Antibody to human leukocyte antigens (HLA), solid phase assays (eg, microspheres or beads, ELISA, Flow cytometry); high definition qualitative panel for identification of antibody specificities (eg, individual antigen per bead methodology), HLA Class II

The human leukocyte antigen (HLA) system is a critical component of the major histocompatibility complex (MHC), which plays a vital role in the immune system's ability to recognize self from non-self. This system is essential for the identification of specific characteristics of an individual's cells and tissues, thereby enabling the body to defend against foreign substances, including microorganisms and non-self cells and tissues. The HLA system is divided into two main classes: Class I and Class II. The testing associated with CPT® Code 86833 focuses on the identification of HLA Class II alloantibodies, which are antibodies that can develop against HLA antigens following organ transplantation or blood transfusion. The procedure involves the use of high definition qualitative panels that utilize solid phase assays, such as microspheres or beads, enzyme-linked immunosorbent assay (ELISA), and flow cytometry. These methodologies allow for the precise detection and characterization of HLA alloantibodies, which is crucial for predicting the risk of immunological responses in transplant scenarios. Specifically, this test identifies antibody specificities to individual HLA antigens, including DRB1/3/4/5, DQA1, DQB1, DPA1, and DPB1, using an array of up to 98 beads, each coated with specific HLA molecules. This detailed identification process is essential for ensuring compatibility in organ transplantation and improving patient outcomes.