Rheumatoid Factor

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** 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.

**Synonyms:** - RA Factor - RF - RF