HLA-B Typing (Human Leukocyte Antigen B)

Human Leukocyte Antigen B (HLA-B) typing is a genetic test that identifies your specific HLA-B alleles, which form part of the major histocompatibility complex (MHC) responsible for immune recognition. This test is particularly relevant for individuals undergoing organ or stem cell transplantation assessment, those with suspected HLA-B associated drug hypersensitivity, and anyone seeking insight into immune-mediated predisposition. Using PCR-hybridisation, the test provides high-resolution typing of the HLA-B locus.

What the test screens for

• HLA-B Typing: Identifies the specific HLA-B alleles present. This information is critical for matching donors and recipients in transplantation, assessing risk for severe drug reactions such as abacavir hypersensitivity (strongly linked to HLA-B57:01) and carbamazepine-induced Stevens-Johnson syndrome (linked to HLA-B15:02), and evaluating predisposition to certain autoimmune and inflammatory conditions including ankylosing spondylitis (HLA-B27), Behçet's disease, and reactive arthritis.

Why it matters

HLA-B typing delivers actionable genetic information that can guide clinical decisions, prevent life-threatening adverse drug reactions, and inform transplant compatibility. For patients and clinicians, it provides a clearer picture of immune-mediated risk and supports personalised treatment strategies.