Definitions for "Rheumatoid factor"
A blood component pathologically increased in concentration in various connective tissue disorders, notably rheumatoid arthritis.
an antibody that is usually found in the blood of adults who have rheumatoid arthritis is rarely present in children who have juvenile arthritis. Rheumatoid factor is more likely to occur in girls who have had many affected joints.
IgM antibodies produced by some patients against their own IgG.