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There is an association between rheumatoid factor and more persistently active synovitis, more joint damage, greater eventual disability and arthritis. [12] [13] Other than in rheumatoid arthritis, rheumatoid factor may also be elevated in other conditions, including: Systemic lupus erythematosus (SLE) [14] [15] Sjögren syndrome [14] [15]
A few substances are below this main interval, e.g. thyroid stimulating hormone, being measured in mU/L, or above, like rheumatoid factor and CA19-9, being measured in U/mL. By enzyme activity [ edit ]
Ninety-six percent of patients with lupus induced by procainamide will have a positive test for anti-histone antibodies, and 100% of patients whose lupus was induced by penicillamine, isoniazid, or methyldopa will have a positive test for anti-histone antibodies. In 70% of patients with rheumatoid arthritis, Felty's syndrome, Sjogren's syndrome ...
ANA is a marker of the autoimmune process – it is positive with a variety of different autoimmune diseases but not specific. Consequently, if an ANA test is positive, it is often followed up with other tests associated with arthritis and inflammation , such as a rheumatoid factor (RF), an erythrocyte sedimentation rate (ESR), a c-reactive ...
The typical rheumatoid nodule may be a few millimetres to a few centimetres in diameter and is usually found over bony prominences, such as the elbow, the heel, the knuckles, or other areas that sustain repeated mechanical stress. Nodules are associated with a positive RF (rheumatoid factor) titer, ACPA, and severe erosive arthritis. Rarely ...
Positive ANA as well as anti-DNA antibodies have been reported in patients with autoimmune thyroid disease. [65] [66] ANA can have a positive test result in up to 45% of people with autoimmune thyroid conditions or rheumatoid arthritis and up to 15% of people with HIV or hepatitis C.
Heterophile antibodies are of particular importance in clinical medicine for their use in detecting Epstein-Barr Virus (the causative agent of infectious mononucleosis). EBV infection induces the production of several antibody classes, of which heterophile antibodies are one (others include anti-i, rheumatoid factor and ANA). Heterophile ...
In a comparative study (in 2007), various detection kits had a sensitivity between 69.6% and 77.5% and a specificity between 87.8% and 96.4%. [12] Despite the excellent performance of these immunoassays, for example CCP-assays, they only provide a sensitivity comparable with that of rheumatoid factor (RF).