Rheumatoid Factor CSF

This test assists in the diagnosis of rheumatoid arthritis. Rheumatoid factor is an antibody that can bind to other antibodies. Antibodies are normal proteins in our blood that are important parts of our immune system. Rheumatoid factor is an antibody that is not usually present in the normal individual. Central nervous system vasculitis is a rarely described complication of rheumatoid arthritis. As with rheumatoid vasculitis in general, the cause of CNS vasculitis in rheumatoid arthritis (RA) is unknown.