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The Rheumatoid Factor (RF) blood test measures the level of autoantibodies often present in rheumatoid arthritis and other autoimmune conditions. Elevated RF levels can indicate an ongoing immune system attack against the body’s own tissues. This test is commonly used to help diagnose rheumatoid arthritis, especially when joint pain, swelling, and stiffness are present. RF may also be elevated in other autoimmune diseases such as lupus and Sjögren’s syndrome. Identifying RF early allows for faster diagnosis and earlier treatment to prevent long-term joint damage. Testing Rheumatoid Factor is a key part of autoimmune screening for patients experiencing chronic joint or systemic symptoms.