What You Need to Know About the Rheumatoid Factor

The rheumatoid factor (RF) test can help evaluate your RA diagnosis and prognosis. Rheumatoid factor (RF) is the antibody responsible for the body attacking its own tissues in patients with rheumatoid arthritis (RA). In most cases, high levels of rheumatoid factor (20 IU/mL or above) occur in patients who have rheumatoid arthritis and/or Sjögren’s syndrome….