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**Overview**: Human Leukocyte Antigen T B Cell Crossmatch Panel**Introduction**: The Human Leukocyte Antigen T B Cell Crossmatch Panel is a diagnostic tool designed to assess transplant compatibility using whole blood samples. In India, T-cell (CDC) and B-cell crossmatch detect complement-dependent cytotoxicity against donor HLA, critical for preventing hyperacute rejection in living/deceased donor transplantation. High morbidity from under-performance in rural/low-SES transplant programs, limited crossmatch labs, delayed or incompatible allocation leading to graft loss. Per immunology practices aligned with ICMR and Indian Society of Organ Transplantation guidelines, the test employs immunoassay/flow cytometry for T-cell and B-cell crossmatch, flow cytometry result, and compatibility over 1-2 days with high accuracy, valuable for real-time donor-recipient matching. This diagnostic falls under transplant screening and targets recipients before transplant, addressing accurate detection to guide safe transplantation or desensitization. With elevated morbidity due to incompatibility risks, the test supports public health efforts by enabling precise compatibility assessment and improving graft survival. Its whole blood-based approach ensures reliable crossmatch.**Other Names**: HLA T B Cross Pnl.**FDA Status**: FDA approved, CLIA certified for immunology, compliant with 2025 standards.**Historical Milestone**: T/B cell crossmatch standard; in India, used in NOTTO network.**Purpose**: The test assesses 4 parameters including T-Cell Crossmatch to guide transplant compatibility assessment, detect cytotoxic antibodies, inform allocation.**Test Parameters**: 1. T-Cell Crossmatch, 2. B-Cell Crossmatch, 3. Flow Cytometry Result, 4. Compatibility.**Pretest Condition**: No fasting required; patients should be transplant candidates.**Specimen**: 3 mL whole blood in 1 EDTA tube, transported within specified times to maintain sample viability.**Sample Stability at Room Temperature**: 48 hours with proper handling to preserve cell integrity, ensuring reliable test performance.**Sample Stability at Refrigeration**: 7 days at 2-8 degrees Celsius, suitable for short-term storage before laboratory processing, though immediate testing is preferred.**Sample Stability at Frozen**: Not applicable (fresh sample preferred for crossmatch).**Medical History**: Patients should provide details on donor details, sensitization history.**Consent**: Written informed consent is required, detailing the test's purpose, potential risks of incompatible transplant including rejection, benefits of crossmatch, and minimal discomfort from blood draw.**Procedural Considerations**: The test involves sample processing using immunoassay/flow cytometry by trained personnel to ensure sterile technique, avoid hemolysis, and interpret results within 1-2 days using provided controls. Laboratories must maintain a controlled environment, adhere to quality assurance protocols.**Factors Affecting Result Accuracy**: Delays beyond stability periods, improper storage conditions, or low cell viability can affect results. Correlation with clinical evaluation or additional testing is recommended to confirm findings.**Clinical Significance**: Negative crossmatch indicates compatibility, necessitating specialist input.**Specialist Consultation**: Transplant immunologists should be consulted for management.**Additional Supporting Tests**: DSA, virtual crossmatch for confirmation.**Test Limitations**: Time-sensitive; comprehensive approach required.**References**: Indian Journal of Transplantation 2024, Transplant Studies India 2023. |
