Overview: HLA High Resolution NGS Typing TestIntroduction: The HLA High Resolution NGS Typing Test provides high-resolution HLA typing via next-generation sequencing (NGS) for precise transplant matching, preventing rejection. Aligned with 2023 ASHI guidelines, it uses NGS for high specificity, supporting transplant screening. This test is critical for guiding transplant decisions, ensuring precise donor matching, and improving outcomes in molecular pathology for patients undergoing organ or bone marrow transplantation.
Other Names: HLA NGS Assay, High Resolution HLA Typing Test.
FDA Status: Laboratory-developed test (LDT), meeting molecular pathology standards for diagnostic accuracy.
Historical Milestone: HLA typing began in the 1960s with serologic methods. NGS-based HLA typing emerged in the 2010s, revolutionizing precision in transplant matching.
Purpose: Provides high-resolution HLA typing for transplant compatibility, guides precise donor matching, and prevents rejection in patients.
Test Parameters: 1. HLA High Resolution Typing
Pretest Condition: No fasting required. Collect whole blood, buccal swab, or saliva at any time. Report history of transplants, autoimmune diseases, or family history of HLA-related conditions.
Specimen: 2-5 mL whole blood (EDTA), 1-2 buccal swabs (sterile swab), or 1-2 mL saliva (sterile container). Transport in a biohazard bag within 24 hours.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: Not frozen
Medical History: Document history of transplants, autoimmune diseases, or family history of HLA-related conditions. Include current medications and prior transplant history.
Consent: Written consent required, detailing the tests purpose, compatibility implications, and potential need for transplant planning.
Procedural Considerations: Uses NGS to provide high-resolution HLA typing across multiple loci. Results are available in 3-5 days, supporting clinical decisions. Performed in laboratories, often for complex transplant cases.
Factors Affecting Result Accuracy: Improper sample handling, contamination, or low DNA quality can affect results. Complex alleles may require additional analysis.
Clinical Significance: High-resolution HLA typing ensures precise donor-recipient compatibility, minimizing rejection risk. Mismatches guide immunosuppression planning.
Specialist Consultation: Consult a transplant immunologist or hematologist for result interpretation and transplant planning.
Additional Supporting Tests: HLA antibody screening, crossmatch testing, or low-resolution HLA typing to confirm compatibility.
Test Limitations: Higher cost and longer turnaround time compared to low-resolution typing. Clinical correlation is needed.
References: ASHI HLA Guidelines, 2023; Human Immunology, Robinson J, 2022.
