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Rheumatoid factor is part of the 2010 ACR/EULAR classification criteria for rheumatoid arthritis. RF positivity combines well with anti-CCP and/or 14-3-3η to inform diagnosis. [9] RF positivity at baseline has also been described as a good prognostic marker for future radiographic damage. [10]
Blood tests for specific markers of autoimmune diseases to verify lupus or rheumatoid arthritis symptoms. Culture of the joint fluid or a blood sample if infectious arthritis is suspected.
HLA-B27 is implicated in other types of seronegative spondyloarthropathy, such as reactive arthritis, acute anterior uveitis, iritis, Crohn's and ulcerative colitis associated spondyloarthritis. The shared association with HLA-B27 leads to increased clustering of these diseases.
But tests, such as joint fluid analysis or blood tests, can help medical providers see certain markers that point to some kinds of arthritis more than others. justocker / iStock Treatment
Other blood tests are usually done to differentiate from other causes of arthritis, like the erythrocyte sedimentation rate (ESR), C-reactive protein, full blood count, kidney function, liver enzymes and other immunological tests (e.g., antinuclear antibody/ANA) are all performed at this stage.
For example, the detection of certain autoantibodies in patient blood is a reliable biomarker for autoimmune disease, and the detection of rheumatoid factors has been an important diagnostic marker for rheumatoid arthritis (RA) for over 50 years.
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