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High levels of rheumatoid factor (in general, above 20 IU/mL, 1:40, or over the 95th percentile; there is some variation among labs) occur in rheumatoid arthritis (present in 80%) and Sjögren's syndrome (present in 50-70% of primary forms of disease). [11] The higher the level of RF the greater the probability of destructive articular disease.
During the first year of illness, rheumatoid factor is more likely to be negative with some individuals becoming seropositive over time. RF is a non-specific antibody and seen in about 10% of healthy people, in many other chronic infections like hepatitis C, and chronic autoimmune diseases such as Sjögren's syndrome and systemic lupus ...
Their significance is greater than that of rheumatoid factor. Recently a serological point-of-care test (POCT) for the early detection of RA has been developed. This assay combines the detection of rheumatoid factor and anti-MCV for diagnosis of rheumatoid arthritis and shows a sensitivity of 72% and specificity of 99.7%. [4] [5]
Rheumatoid arthritis is generally worse in the morning and associated with stiffness lasting over 30 minutes. [64] On the other hand, with osteoarthritis, the pain tends to initially be related to activity and then becomes more constant over time. [65] Osteoarthritis in the left hand index finger of a 63-year-old woman
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).
Rheumatoid factor, an autoantibody commonly associated with rheumatoid arthritis This page was last edited on 19 April 2013, at 22:33 (UTC). Text is available under ...
Rheumatology (from Greek ῥεῦμα (rheûma) 'flowing current') is a branch of medicine devoted to the diagnosis and management of disorders whose common feature is inflammation in the bones, muscles, joints, and internal organs. [1]
Juvenile idiopathic arthritis (JIA), formerly known as juvenile rheumatoid arthritis (JRA), [1] is the most common chronic rheumatic disease of childhood, affecting approximately 3.8 to 400 out of 100,000 children. [3]