The information in this article refers to the diagnosis of axial spondyloarthritis (axSpA) also known as ankylosing spondylitis (AS). The diagnosis of is axSpA is different to the diagnosis of non-radiographic axial-spondyloarthritis (nr-axSpA). This is because damage to the joints in people with axSpA can be seen on radiographic (x-ray) images. Whereas joint damage can not be seen on x-ray images in people with nr-axSpA. Doctors might diagnose nr-axSpA by the presence of clinical features and inflammation detected on an magnetic resonance imaging (MRI) scan.
To read more about how non-radiographic axial spondyloarthritis (nr-axSpA) is diagnosed please read how is nr-axSpA diagnosed?
There is no definitive test to diagnose axSpA. If your General practitioner (GP) thinks you may have axSpA they will refer you to a rheumatologist. A rheumatologist is a specialist who is an expert in diagnosing and treating arthritis. Your rheumatologist will take a range of tests to reach a axSpA diagnosis.
You will need a referral from your GP to see a rheumatologist. It is important to describe your symptoms in as much detail as possible, so your GP can properly assess you. Your GP may ask you about:
For a rheumatologist to diagnose you with axSpA they will need to take a range of tests. These tests include a physical examination, investigation of your family history, blood tests, x-rays, and other imaging scans.
Your rheumatologist will:
The HLA-B27 gene is strongly linked to the development of axSpA. About one in eight people with the gene develop axSpA. So even if you have the gene, you may never develop axSpA. If you are suspected of having axSpA your doctor will take a blood test to check whether you have the HLA-B27 gene. Your rheumatologist will use this in conjunction with other tests to determine an axSpA diagnosis.
It is always helpful to prepare for your appointment. This will help you to get the most out of your time with your doctor. Here are a few suggestions to help prepare:
Diagnosing axSpA is not always straightforward and may take longer than you had hoped. On average people wait 5-7 years for a diagnosis from the onset of symptoms. axSpA can be difficult to diagnose for different reasons including:
Here are some suggestions that might help you to receive a timelier diagnosis: