Rheumatoid factors (RFs) are a class of autoantibodies that reacts with autoimmunoglobulins of human. RFs mainly include three isotypes, which are IgM RF, IgG RF and IgA RF, and have been used as diagnostic biomarkers for rheumatoid arthritis (RA). Creative BioMart Biomarker offers high quality detection service for RFs, ensuring high detection accuracy, sensitivity and efficiency for each sample.