RF
An antibody marker associated with rheumatoid arthritis.
What is it
Rheumatoid factor is an autoantibody that targets the body's own immunoglobulins. Elevated levels have been associated with rheumatoid arthritis and certain other conditions.
Why it's measured
RF has been used in clinical evaluation of rheumatoid arthritis, though it is not specific to that condition.
Reference range
Standard laboratory reference
< 14 IU/mL
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with rheumatoid arthritis and certain other autoimmune conditions in published research.
Lower
Is generally considered favorable.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Used when joint symptoms suggest a rheumatologic condition.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.