HLA - BONE MARROW TRANSPLANT A,B,C DR & DQ TYPING

HLA typing is a DNA-based test that identifies a patient’s human leukocyte antigens—cell-surface proteins crucial for immune recognition—used before bone marrow (stem cell) transplant to find a compatible donor. Samples (blood or cheek swab) are analyzed for HLA genes (commonly A, B, C, DRB1, DQB1). High-resolution matches reduce graft-versus-host disease, graft failure and improve transplant success, especially with unrelated donors.

Ideal HLA matching is a full high‑resolution match. For unrelated adult donors, an 8/8 match (HLA‑A, ‑B, ‑C, ‑DRB1) is standard; 10/10 (adding DQB1) is preferred when available. Sibling donors often provide full matches. Cord‑blood transplants can tolerate looser matches (e.g., 4/6–5/6), and haploidentical (half‑matched) transplants work with specialized protocols. Better matches reduce graft‑versus‑host disease and improve survival.

HLA compatibility is critical in bone marrow transplants because matching patient and donor HLA proteins reduces graft‑versus‑host disease, lowers rejection risk, and improves engraftment and survival. High‑resolution matches at key loci (HLA‑A, HLA‑B, HLA‑C, HLA‑DRB1)—often from siblings—give the best outcomes; partially matched unrelated donors or cord blood may be used when perfect matches aren’t available but carry higher complication risks.

HLA‑DR stands for Human Leukocyte Antigen DR, a type of class II major histocompatibility complex (MHC) molecule on antigen‑presenting cells. It displays peptide fragments to CD4+ helper T cells, guiding immune responses. HLA‑DR typing is used for transplant compatibility and is linked to susceptibility to certain autoimmune conditions; specific HLA‑DR alleles can affect disease risk and clinical decisions.

HLA typing in India typically costs between ₹2,000–₹30,000 depending on resolution and number of loci. Basic or single‑locus tests (e.g., HLA‑B27) often run ₹700–₹5,000; low‑resolution multi‑locus typing ₹3,000–₹10,000; high‑resolution sequence‑based panels for donor matching ₹10,000–₹30,000. Prices vary by lab, city and urgency—confirm with the testing center.

A good HLA match means donor and recipient share as many human leukocyte antigens as possible—ideally identical at key loci (commonly HLA‑A, HLA‑B and HLA‑DR for kidney, and more loci for stem‑cell transplants). A 6/6, 8/8 or 10/10 match lowers rejection risk, improves graft survival and reduces immunosuppression. Sibling donors often give the best matches; a negative crossmatch is also essential.