--- title: Rheumatoid Factor (RF) Test type: test id: rheumatoid-factor url: "https://www.test-well.com/tests/rheumatoid-factor" price_usd: 21.99 lab_fee_usd: 6 all_in_usd: 27.99 cpt: 86431 category: Inflammation & Autoimmune sample: Blood draw fasting_required: false results_in: "2–4 business days" labs: - Quest - Labcorp - BioReference orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=rheumatoid-factor&utm_source=ai_agent&utm_medium=markdown" --- # Rheumatoid Factor (RF) Test > Screens for rheumatoid arthritis and other autoimmune conditions, measured from a standard blood draw. At TestWell it costs $21.99 plus a $6 lab fee, needs no fasting, and results post in 2–4 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $21.99 + $6 lab processing fee per order ($27.99 all-in for this test alone) | | CPT code | 86431 | | Sample | Blood draw | | Fasting | Not required | | Results | 2–4 business days | | Labs | Quest Diagnostics, Labcorp, BioReference (NY & NJ) | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the Rheumatoid Factor (RF) test tell you? Screens for rheumatoid arthritis and other autoimmune conditions. 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. **Clinical use:** Inflammation and autoimmune biomarkers help identify systemic inflammation, suspected autoimmune disease, and disease activity in known autoimmune conditions. ## Who should order it? 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. ## Biomarkers measured - [Rheumatoid Factor](https://www.test-well.com/biomarkers/rheumatoid-factor) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $21.99 | $27.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $21.99 | $27.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | BioReference (NY & NJ) | $33.99 | $39.99 | New York and New Jersey orders route here automatically | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does a Rheumatoid Factor (RF) test cost? A Rheumatoid Factor (RF) test costs $21.99 at TestWell — $27.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $100.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible. | Where you order | Price | One test, all-in | Notes | | --- | --- | --- | --- | | TestWell (drawn at Quest or Labcorp) | $21.99 | $27.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $100.00 | $100.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 4418 · Labcorp test no. 006502 · BioReference code TN13-3. ## How do you prepare? No fasting required. ## Related conditions - Autoimmune disease (M35.9) - Systemic inflammation (R79.89) ## Common questions about the Rheumatoid Factor (RF) test ### How long do Rheumatoid Factor (RF) results take? Most Rheumatoid Factor (RF) results are available in 2–4 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal. ### What sample is collected for the Rheumatoid Factor (RF)? Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available. ### How much does the Rheumatoid Factor (RF) cost without insurance? On TestWell, the Rheumatoid Factor (RF) is $21.99. Quest Direct lists comparable tests at $35. Walk-in hospital labs typically bill $100 or more without insurance. Insurance is not required — pay one all-in price. ### Do I need to fast before the Rheumatoid Factor (RF)? No fasting required for the Rheumatoid Factor (RF). No fasting required. ### Where can I get the Rheumatoid Factor (RF) done? The Rheumatoid Factor (RF) is available at Quest and Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=rheumatoid-factor&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Quest Diagnostics, Labcorp, BioReference (NY & NJ) patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 2–4 business days with reference ranges and flags. ## Related - [ANA Test Results Explained: Titers, Patterns, and What a Positive ANA Means](https://www.test-well.com/guides/ana-test-results-explained) - [Autoimmune Screening Panel](https://www.test-well.com/tests/autoimmune-screening-panel) — 4 tests · $86.99 - [Autoimmune Panel](https://www.test-well.com/tests/autoimmune-panel) — 5 tests · $129.99 - [Autoimmune Advanced Panel](https://www.test-well.com/tests/autoimmune-advanced-panel) — 11 tests · $159.99 - [Rheumatoid Arthritis Antibody Test (Anti-CCP)](https://www.test-well.com/tests/anti-ccp-antibody) — $32.99 - [Sed Rate (ESR)](https://www.test-well.com/tests/sed-rate-esr) — $24.99 - [All Inflammation & Autoimmune tests](https://www.test-well.com/tests/category/inflammation-autoimmune) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-14. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/rheumatoid-factor Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.