Rheumatoid Factor Chart

A normal or negative rheumatoid factor (RF) result is typically under 15 u/mL or less than a 1:80 titer, although some laboratories may consider up to 20 u/mL normal, especially for older adults.

RF results above the normal range may suggest rheumatoid arthritis or another autoimmune disease, especially if paired with a positive anti-CCP antibody test. A positive RF alone, however, does not confirm a diagnosis and is best interpreted alongside other lab tests and patient symptoms.

Reducing RF levels may involve managing underlying conditions such as rheumatoid arthritis with anti-inflammatory medications, lifestyle changes like regular exercise, and, in some cases, disease-modifying drugs. Consult a healthcare provider for personalized recommendations.