CPT® Code 86816

1. Indications

HLA typing is indicated for several specific conditions and scenarios, particularly in the context of disease susceptibility and transplantation compatibility. The following are the primary indications for performing HLA typing:

• Celiac Disease - Testing for HLA-DQ2 and HLA-DQ8 is performed in symptomatic patients or those with a family history of celiac disease to assess susceptibility.
• Narcolepsy - HLA-DR15 and HLA-DQ6 typing is utilized to differentiate narcolepsy from other sleep disorders, aiding in accurate diagnosis.
• Autoimmune Disorders - HLA-DR and HLA-DQ typing is conducted to identify susceptibility to various autoimmune conditions.
• Transplant Compatibility - HLA typing is essential for determining tissue compatibility between potential organ, stem cell, or bone marrow donors and recipients.

2. Procedure

The procedure for HLA typing involves several key steps that ensure accurate identification of the specific antigens. The following outlines the procedural steps involved:

• Sample Collection - A blood sample is collected from the patient, which serves as the source of DNA for HLA typing. This sample is typically drawn from a vein in the arm using standard venipuncture techniques.
• DNA Extraction - The collected blood sample undergoes a process of DNA extraction, where the cellular components are separated to isolate the DNA. This step is crucial for obtaining a pure sample that can be analyzed for HLA antigens.
• Amplification of HLA Genes - Polymerase chain reaction (PCR) techniques are employed to amplify the specific regions of the HLA genes that correspond to the DR and DQ antigens. This amplification is necessary to ensure that there is enough genetic material for accurate typing.
• Typing Analysis - The amplified DNA is then analyzed using various methods, such as sequence-specific oligonucleotide probes or next-generation sequencing, to identify the presence of specific HLA alleles. This analysis determines the individual's HLA type.
• Result Interpretation - The results of the HLA typing are interpreted by a qualified laboratory professional, who will provide a report detailing the specific HLA antigens identified in the sample.

3. Post-Procedure

After the HLA typing procedure, there are typically no specific post-procedure care requirements for the patient, as the process is minimally invasive and involves only a blood draw. Patients may resume normal activities immediately following the sample collection. The results of the HLA typing are usually available within a few days, and healthcare providers will discuss the findings with the patient, particularly in the context of any relevant medical conditions or potential transplant considerations. It is important for patients to follow up with their healthcare provider to understand the implications of their HLA typing results and any necessary next steps.