HLA-B27: What a Positive Result Means
HLA B-27 is a one-time genetic test providing lifelong information about spondyloarthropathy susceptibility. Proactive testing helps interpret inflammatory back symptoms.
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HLA-B27 is an inherited marker on the white blood cells: it is present or absent, and that stays the same for life. Star-SHL and Unilabs give negative as the expected result.
- With HLA-B27, the chance of ankylosing spondylitis (Bechterew's disease) and of eye inflammation (uveitis) is higher, but only 2 to 5 percent of HLA-B27 carriers develop ankylosing spondylitis.
- A negative HLA-B27 result does not rule out ankylosing spondylitis or a related disease.
- A diagnosis such as ankylosing spondylitis cannot be made on an HLA-B27 test alone.
HLA B-27 (PCR): what this test measures
This PCR test identifies the presence or absence of the HLA-B27 gene. It is a one-time genetic test — your HLA-B27 status does not change over time.
HLA B-27 (PCR): why this value matters
HLA-B27 positivity supports the diagnosis of spondyloarthropathy in patients with inflammatory back pain. It does not diagnose any condition on its own but increases the likelihood of spondyloarthritis when symptoms are present.
HLA B-27 (PCR): how the blood test works
- Referral
- No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
- The draw
- A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
- Which test
- on its own €149,-
- Where
- 650+ draw sites run by independent laboratories across the Netherlands. Draw sites
HLA B-27 (PCR): when is testing worthwhile?
Testing could be indicated for chronic inflammatory back pain (especially in young adults), suspected ankylosing spondylitis, acute anterior uveitis, reactive arthritis, or family history of spondyloarthropathy.
HLA B-27 (PCR): symptoms of a high or low value
Low Levels
A negative HLA-B27 makes spondyloarthropathy less likely but does not exclude it. Approximately 5-10% of ankylosing spondylitis patients are HLA-B27 negative.
High Levels
HLA-B27 positivity does not cause symptoms. Most HLA-B27 positive individuals never develop spondyloarthritis. The gene increases susceptibility but additional factors are needed for disease development.
HLA B-27 (PCR): lifestyle and this value
If HLA-B27 positive with inflammatory back symptoms, early rheumatology referral is important. Regular exercise, particularly swimming and stretching, helps maintain spinal mobility. Good posture habits and smoking cessation are also important.
HLA B-27 (PCR): frequently asked questions
Does HLA-B27 positive mean I have ankylosing spondylitis?
No. Only a small percentage of HLA-B27 positive individuals develop the disease. The gene increases susceptibility but most carriers remain healthy.
Is HLA-B27 hereditary?
Yes. HLA-B27 is inherited. If you carry it, there is approximately a 50% chance each child will inherit it.
What conditions are associated with HLA-B27?
Ankylosing spondylitis, reactive arthritis, psoriatic arthritis, inflammatory bowel disease-associated arthritis, and acute anterior uveitis.
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Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
HLA B-27 (PCR)
€149,-