Rheumatoid factor test cost in San Francisco, CA
In San Francisco-Oakland-Fremont, CA, 26 hospitals list a cash price for rheumatoid factor (RF) test: from $6.60 to $1,217.00, with a median of $55.18. The lowest listed price is at Sequoia Hospital — $48.58 less than the median here. Across California, the median is $13.20 at 194 hospitals.
- The median here, $55.18, is 36% above the US median of $40.48.
- That is 9.7× Medicare's 2026 national rate for the same service ($5.67).
- San Francisco, CA ranks 5th of 5 metro areas in California by median, cheapest first.
- 12 of 26 hospitals list a cash price equal to their full list price, with no self-pay discount.
Cash prices at 26 facilities across 18 cities for code 86431, as an outpatient — the setting a self-pay patient normally buys. Collected Oct 31, 2026; the hospital files themselves were last updated between Feb 23, 2026 and Sep 30, 2026.
Lowest$6.60Sequoia Hospital
Median$55.18half of hospitals charge less
Highest$1,217.00in this market
Difference184.4×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in San Francisco-Oakland-Fremont, CA.
median
Lowest $6.60Highest $1,217.00
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Sequoia Hospital lowest Redwood City, CA · (650) 369-5811 RL-A-RAPANEL 3017891C File of Sep 30, 2026 · source file | $6.60 | $19.34 | $4.07–$20.17 | 66% |
| Sequoia Hospital Redwood City, CA · (650) 369-5811 RL-A-RA PNL R 3016635B File of Sep 30, 2026 · source file | $7.74 | $22.66 | $4.76–$22.66 | 66% |
| MarinHealth Medical Center Greenbrae, CA · (415) 925-7900 RHEUMATOID FACTOR QUANT File of Mar 26, 2026 · source file | $8.12 | $13.53 | $5.67–$2,330.00 | 40% |
| Sequoia Hospital Redwood City, CA · (650) 369-5811 RL-A-ILD PANEL2 3018869D File of Sep 30, 2026 · source file | $8.53 | $25.00 | $5.25–$25.00 | 66% |
| St. Rose Hospital Hayward, CA · (510) 782-6200 LC-RHEUMATOID FACTOR QUANT File of Feb 23, 2026 · source file | $17.55 | $58.50 | $5.28–$49.73 | 70% |
| St. Rose Hospital Hayward, CA · (510) 782-6200 LC-RHEUMATOID FACTOR-QUANT File of Feb 23, 2026 · source file | $17.88 | $59.59 | $5.28–$50.65 | 70% |
| St. Rose Hospital Hayward, CA · (510) 782-6200 RHEUM.ARTHRITISFACTRTITER File of Feb 23, 2026 · source file | $42.84 | $142.80 | $5.28–$121.38 | 70% |
| Kaiser Foundation Hospital - San Leandro San Leandro, CA · (510) 454-1000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Fnd Hospital - Richmond Campus Richmond, CA · (510) 752-1000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Fremont Fremont, CA · (510) 784-4000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Oakland/Richmond Oakland, CA · (510) 752-1000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Walnut Creek Walnut Creek, CA · (925) 295-4000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Redwood City Redwood City, CA · (650) 299-2000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Antioch Antioch, CA · (925) 813-6500 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - South San Francisco South San Francisco, CA · (650) 742-3200 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - San Francisco San Francisco, CA · (415) 833-2646 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - San Rafael San Rafael, CA · (415) 444-2000 RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $45.36 | $81.00 | $5.00–$15.00 | 44% |
| Mills-Peninsula Medical Center Burlingame, CA · (650) 696-5400 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $65.00 | $65.00 | — | — |
| Mills Health Center San Mateo, CA · (650) 696-5400 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $65.00 | $65.00 | — | — |
| Sequoia Hospital Redwood City, CA · (650) 369-5811 SF-RA FACTOR TITER File of Sep 30, 2026 · source file | $67.21 | $197.00 | $5.67–$161.54 | 66% |
| Stanford Health Care Tri-Valley Pleasanton, CA · (925) 847-3000 HC Rheumatoid Factor Quant File of Apr 1, 2026 · source file | $77.60 | $194.00 | — | 60% |
| Novato Community Hospital Novato, CA · (415) 209-1300 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Sutter Delta Medical Center Antioch, CA · (925) 779-7200 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Alta Bates Summit Medical Center - Alta Bates Camp Berkeley, CA · (510) 204-4444 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Alta Bates Summit Medical Center Oakland, CA · (510) 655-4000 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Eden Medical Center Castro Valley, CA · (510) 537-1234 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| California Pacific Medical Ctr-Davies Campus Hospital San Francisco, CA · (415) 600-6000 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| California Pacific Medical Center- Van Ness Campus San Francisco, CA · (415) 600-6000 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Alta Bates Summit Medical Center - Herrick Campus Berkeley, CA · (510) 204-4444 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Alta Bates Summit Medical Center-Summit Campus-Hawthorne Oakland, CA · (510) 655-4000 HCHG RHEUMATOID FACTOR QUANTITATIVE File of Apr 1, 2026 · source file | $78.00 | $78.00 | — | — |
| Novato Community Hospital Novato, CA · (415) 209-1300 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Mills Health Center San Mateo, CA · (650) 696-5400 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| California Pacific Medical Center- Van Ness Campus San Francisco, CA · (415) 600-6000 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Alta Bates Summit Medical Center Oakland, CA · (510) 655-4000 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| California Pacific Medical Ctr-Davies Campus Hospital San Francisco, CA · (415) 600-6000 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Eden Medical Center Castro Valley, CA · (510) 537-1234 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Sutter Delta Medical Center Antioch, CA · (925) 779-7200 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Alta Bates Summit Medical Center-Summit Campus-Hawthorne Oakland, CA · (510) 655-4000 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Mills-Peninsula Medical Center Burlingame, CA · (650) 696-5400 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Alta Bates Summit Medical Center - Alta Bates Camp Berkeley, CA · (510) 204-4444 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| Alta Bates Summit Medical Center - Herrick Campus Berkeley, CA · (510) 204-4444 HCHG CORE RHEUMATOID FCTR QN File of Apr 1, 2026 · source file | $79.00 | $79.00 | — | — |
| MarinHealth Medical Center Greenbrae, CA · (415) 925-7900 RHEUMATOID FACTOR LEVEL File of Mar 26, 2026 · source file | $156.60 | $261.00 | $5.67–$2,330.00 | 40% |
| Chinese Hospital San Francisco, CA · (415) 677-2480 Rheumatoid factor level File of Jul 22, 2026 · source file | $1,217.00 | $1,217.00 | $5.67–$2,190.60 | — |
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.
No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More
Outpatient: lowest $6.60, median $55.18, highest $1,217.00 — a 184.4× difference within the same market.
As an inpatient, the same code is billed by 24 facilities here, median $45.36. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
Cash or insurance?
At 4 of 14 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What rheumatoid factor test is, what the price covers and why prices differ: Rheumatoid factor test explained.
4 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 86431 ($28.80). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.
| Hospital | Cash price | File |
|---|---|---|
| Stanford Health Care Tri-Valley Pleasanton, CARa - Part of Lupus Collag | $2.12 | file |
| Sequoia Hospital Redwood City, CARL-A-LUPUS COMP 50119C | $2.14 | file |
| Sequoia Hospital Redwood City, CARL-A-RA 50465 | $2.39 | file |
| Sequoia Hospital Redwood City, CARL-A-RA-FL 2003347 | $2.73 | file |
File Link to the hospital's own price file.