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Those with the HLA-B27 variant are at a higher risk than the general population of developing the disorder. HLA-B27, demonstrated in a blood test, can occasionally help with diagnosis, but in itself is not diagnostic of AS in a person with back pain. Over 85% of people that have been diagnosed with AS are HLA-B27 positive, although this ratio ...
Among the Sami in Northern Scandinavia , 24% of people are HLA-B27 positive, while 1.8% have associated ankylosing spondylitis, [3] compared to 14-16% of Northern Scandinavians in general. [ 4 ] [ 5 ] In Finland, an estimated 14% of the population is positive for HLA-B27, while more than 95% of patients with ankylosing spondylitis and ...
HLA-B27 is a polymorphic form of the HLA-B molecule found in up to 95% of people with ankylosing spondylitis of European ancestry, [16] [17] 70% with reactive arthritis, [18] 60% with psoriatic spondylitis, [12] 25% with peripheral psoriatic arthritis, [17] and 70% with spondylitis associated with inflammatory bowel disease. [17] [16]
More than 80% of patients with the ankylosing spondylitis variant test positive for the HLA-B27 biomarker, but not everyone with this biomarker will develop disease. [22] Some people with axial spondyloarthritis may test positive for elevated C-reactive protein, or CRP, depending on their disease activity. [22]
Tests for C-reactive protein and erythrocyte sedimentation rate are non-specific tests that can be done to corroborate the diagnosis of the syndrome. A blood test for the genetic marker HLA-B27 may also be performed. About 75 percent of all patients with reactive arthritis have this gene.
Ankylosing spondylitis: A version of the HLA-B gene called HLA-B27 increases the risk of developing ankylosing spondylitis. It is uncertain how HLA-B27 causes this increased risk. Researchers speculate that HLA-B27 may abnormally display to the immune system peptides that trigger arthritis.
Ankylosing spondylitis (AS) is a type of arthritis in which there is long-term inflammation of the joints of the spine. Typically the joints where the spine joins the pelvis are also affected. Occasionally other joints such as the shoulders or hips are involved. [1] John Addey (1920–1982), [2] English astrologer
Other rheumatological disorders that can cause the features typical for RS3PE include late onset (seronegative) rheumatoid arthritis, acute sarcoidosis, ankylosing spondylitis and other spondyloarthropathies such as psoriatic arthropathy, mixed connective tissue disease, chondrocalcinosis and arthropathy due to amyloidosis. [6] [9]