Health / Medical Topics

    Rheumatoid Factor

    Definition 1

    Antibodies in the serum of individuals with rheumatoid arthritis that react with antigenic determinants or immunoglobulins that enhance agglutination of suspended particles coated with pooled human gamma -globulin. Rheumatoid factors also occur in other autoimmune and certain infectious diseases. (NCI Thesaurus)

    Definition 2

    Antibodies directed against antigenic determinants, i.e., Gm (gamma chain), in the Fc region of IMMUNOGLOBULIN G, found in the serum of about 80% of patients with classical or definite rheumatoid arthritis, but in only about 20% of patients with juvenile rheumatoid arthritis. Rheumatoid factors may be IMMUNOGLOBULIN M, IMMUNOGLOBULIN G, or IMMUNOGLOBULIN A antibodies, although other serological tests measure only IMMUNOGLOBULIN M. Rheumatoid factors also occur in other connective tissue diseases and infectious diseases. (From Dorland, 28th ed) (NLM, Medical Subject Headings)




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