What Is the Rheumatoid Factor Test? A rheumatoid factor test, or RF test, is a blood test to look for rheumatoid factors in your blood. If you have symptoms of rheumatoid arthritis, such as pain ... Rheumatoid factor is an antibody that can damage healthy tissue and cause autoimmune diseases. Learn how a rheumatoid factor test is done, what a normal and high level means, and how it can help diagnose conditions like rheumatoid arthritis. Rheumatoid factor is an antibody that can help diagnose rheumatoid arthritis and other autoimmune diseases. Learn about the normal range, high levels, and false positives of rheumatoid factor blood test. The Rheumatoid Factor (RF) test is a blood test that measures the level of RF antibodies in the blood. RF antibodies are produced by the immune system and may attack healthy tissues in the body by mistake, leading to autoimmune disorders like rheumatoid arthritis. In this article, we will cover an in-depth overview of the RF test.
