Hospital Lab
$100
cash pay
Other Labs
$35
+ lab fees
TestWell
$21.99
+ $6 lab fee
Rheumatoid Factor (RF) is an antibody found in approximately 80% of people with rheumatoid arthritis. While not exclusive to RA (it can be positive in other autoimmune conditions, chronic infections, and even in some healthy people), a positive RF combined with symptoms strongly supports an RA diagnosis. Higher levels generally correlate with more severe disease.
Inflammation and autoimmune biomarkers help identify systemic inflammation, suspected autoimmune disease, and disease activity in known autoimmune conditions.
Anyone with unexplained joint pain, rashes, fatigue, or recurrent fevers; patients with known autoimmune disease monitoring flares; or individuals with strong family history of autoimmune conditions.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed At
Quest or Labcorp
Your Rheumatoid Factor (RF) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
Your Rheumatoid Factor (RF) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
No fasting required.
No fasting required.
TestWell Price
$21.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Autoimmune Panel
Save $11.96This test is part of the Autoimmune Panel — 5 tests · 7 biomarkers for $129.99, $11.96 less than à la carte.
$129.99$141.95
5 tests · 7 biomarkers
Frequently ordered together
Customers who ordered Rheumatoid Factor (RF) also added these for a more complete health picture.
Not sure where to start?
Rheumatoid Factor (RF)
$21.99