How is ankylosing spondylitis (AS) diagnosed?
There isn’t a test that definitively diagnoses ankylosing spondylitis. After reviewing your symptoms and family history, your healthcare provider will perform a physical exam. Your provider may order one or more of these tests to help guide diagnosis:
- Imaging scans: Magnetic resonance imaging (MRI) scans can detect spine problems earlier than traditional X-rays. Still, your provider may order spine X-rays to check for arthritis or rule out other problems.
- Blood tests: Blood tests can check for the presence of the HLA-B27 gene. About 8% of people of European descent have this gene, but only a quarter of them develop ankylosing spondylitis.