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Rheumatoid Factor (RF)

Autoimmune Markers

What is Rheumatoid Factor (RF)?

Antibody associated with rheumatoid arthritis

Why It Matters

Elevated in 70-80% of rheumatoid arthritis cases. Also positive in other autoimmune diseases. Used for diagnosis and prognosis.

Reference Range

<14 IU/mL, Weakly positive:14-40 IU/mL, Positive:>40 IU/mL

Which Providers Test Rheumatoid Factor (RF)?

✓ Function
Included in standard panel
1 out of 10 providers include this test in their standard panels.

Compare Providers

ProviderIncludes TestAnnual CostTotal Biomarkers
Superpower logoSuperpower$199100+
WHOOP Advanced Labs logoWHOOP Advanced Labs$34965
Labcorp OnDemand logoLabcorp OnDemand$39830+
Life Extension logoLife Extension$48640+
Everlywell logoEverlywell$46883
Mito Health logoMito Health$798100+
InsideTracker logoInsideTracker$68048
Function Health logoFunction Health$499100+
Marek Health logoMarek Health$90070+
Blueprint Advanced logoBlueprint Advanced$1150110

Related Information

Medical Disclaimer

This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs and before making decisions about blood testing.