Rheumatoid Factor

The rheumatoid factor (RF) test is a blood test used to help diagnose rheumatoid arthritis, an autoimmune disorder that causes inflammation and pain in the joints. In rheumatoid arthritis, the immune system attacks the lining of the joints, causing swelling, stiffness, and pain. The rheumatoid factor test measures the level of antibodies against rheumatoid factor in the blood. Rheumatoid factor is a type of protein that is produced by the immune system in response to inflammation. However, not all individuals with rheumatoid arthritis have high levels of rheumatoid factor, and some individuals without rheumatoid arthritis can have high levels of rheumatoid factor. The rheumatoid factor test is typically ordered if an individual is experiencing joint pain, stiffness, or swelling, especially in the hands and feet. It may also be ordered if an individual has a family history of rheumatoid arthritis or if they have other autoimmune disorders. The rheumatoid factor test is a simple and non-invasive procedure that involves taking a sample of blood from a vein in the arm. The blood sample is then sent to a laboratory for analysis.

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