RF: Rheumatoid Factor

This assay is for the quantitative determination of human IgG rheumatoid factor antibodies in patient serum. Autoantibodies of the IgG, IgM, or IgA isotype, which are reactive with the crystallizable fraction (Fc) of IgG, are called rheumatoid factors. Rheumatoid factor is found in 50-79% of adults with classical rheumatoid arthritis. The presence of IgG RF antibodies in conjunction with clinical findings and other laboratory tests, is an aid in the diagnosis of rheumatoid arthritis.