How is the rheumatoid factor test done?
This test is quick and virtually painless. Blood is collected from a vein using a needle and the blood sample is sent to the lab for analysis. Along with rheumatoid factor, your doctor may order other lab tests, including: • Complete Blood Count (CBC) to assess blood cells in the body and evaluate for anemia. • Antinuclear antibody (ANA) — antibodies that might be present in 30% to 40% of people with RA. • Erythrocyte Sedimentation rate (SED rate) and C-reactive protein (CRP) — markers of inflammation. • Anti-CCP antibody, which is found in most patients with RA. Other tests, including X-rays, MRI, ultrasound, and other scans, may be ordered. These tests will help the doctor make an accurate diagnosis.
