Endpoint
Rheumatoid factor concentration
Autoantibodies found in adult rheumatoid arthritis patients that are directed against gamma-chain immunoglobulins.
CAT:outcome/rheumatoid-factorreported in IU/mL
How it is measured
Serum rheumatoid factor concentration by clinical immunoassay - nephelometry, turbidimetry or ELISA - reported as a titre in international units per millilitre. The isotype measured, IgM or total, is recorded with each finding.