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HLA-B27: a risk factor for ankylosing spondylitis, not a verdict

A blood test came back 'HLA-B27 positive'. Does that mean you'll get ankylosing spondylitis?

What the science says

HLA-B27 is a version of an immune-system gene. It's associated with a higher risk of ankylosing spondylitis and related inflammatory conditions, but most people who carry HLA-B27 never develop them, and the condition can occur in people who don't carry it. It's a risk factor that clinicians read alongside symptoms and other tests, not a diagnosis on its own.

What Aimosti would show you

HLA typing tells you which HLA versions you carry, restated against the published association. Doing it accurately is technically demanding. HLA is one of the most variable regions of the genome, so proper typing needs specialised analysis of your aligned reads rather than a standard variant file. We name that as a roadmap read rather than approximate it, and we always frame HLA-B27 as a risk factor for a clinician to interpret.

What we won't claim

We won't say HLA-B27 means you have, or will get, ankylosing spondylitis: carrying it is a risk factor most carriers never act on, and only a clinician can put it in context with your symptoms.

Covered in: Pharmacogenomics & HLA (roadmap). Restated from: MedlinePlus Genetics: HLA-B gene · MedlinePlus: Ankylosing spondylitis.