Rheumatoid factor test cost in Seattle, WA
In Seattle-Tacoma-Bellevue, WA, 14 hospitals list a cash price for rheumatoid factor (RF) test: from $12.86 to $52.80, with a median of $29.71. The lowest listed price is at Overlake Medical Center & Clinics — $16.85 less than the median here. Across Washington, the median is $31.95 at 32 hospitals.
Cash prices at 14 facilities across 12 cities for code 86431, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Apr 1, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Seattle-Tacoma-Bellevue, WA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Overlake Medical Center & Clinics lowest Bellevue, WA · (425) 688-5000 Hc Rheumatoid Arthritis Factor | $12.86 | $25.73 | — | 50% | Apr 1, 2026 source file |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC RA TITER | $25.82 | $89.55 | $5.67–$67.17 | 71% | Feb 28, 2026 source file |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC RA TITER | $27.24 | $89.55 | $5.67–$67.17 | 70% | Feb 28, 2026 source file |
| Highline Medical Center Burien, WA · (206) 431-5237 HC RA TITER | $27.35 | $89.55 | $5.67–$80.60 | 69% | Feb 28, 2026 source file |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC RA TITER | $28.11 | $89.55 | $5.67–$67.17 | 69% | Feb 28, 2026 source file |
| Virginia Mason Medical Center Seattle, WA · (206) 223-6600 RHEUMATOID FACTOR TITER | $29.58 | $58.00 | $34.80–$46.40 | 49% | — source file |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC RA TITER | $29.66 | $89.55 | $5.67–$67.17 | 67% | Feb 28, 2026 source file |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC RHEUMATOID FACTOR QUANT | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC RHEUMATOID FACTOR QUANT | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC RHEUMATOID FACTOR QUANTITATIVE LAB | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC RHEUMATOID FACTOR QUANT | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC RHEUMATOID FACTOR QUANTITATIVE LAB | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC RHEUMATOID FACTOR QUANT | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC RHEUMATOID FACTOR QUANTITATIVE LAB | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC RHEUMATOID FACTOR QUANTITATIVE LAB | $29.76 | $62.00 | — | 52% | Apr 1, 2026 source file |
| Enumclaw Regional Hospital Association Enumclaw, WA HC RA TITER | $31.65 | $89.55 | $5.67–$80.60 | 65% | Feb 28, 2026 source file |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC RHEUMATOID FACTOR QUANTITATIVE LAB | $32.24 | $62.00 | — | 48% | Apr 1, 2026 source file |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC RHEUMATOID FACTOR QUANT | $32.24 | $62.00 | — | 48% | Apr 1, 2026 source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Rheumatoid Factor Isotypes, Igg, Iga, & Igm By Eia | $33.66 | $67.31 | — | 50% | Apr 1, 2026 source file |
| Cascade Valley Hospital Arlington, WA · (360) 435-2133 HC RA TITER | $44.80 | $56.00 | $4.76–$44.80 | 20% | — source file |
| Kaiser Permanente Central Hospital Seattle, WA · (206) 326-3000 RHEUMATOID FACTOR QUANTITATIVE | $52.80 | $66.00 | $4.00–$15.00 | 20% | Apr 1, 2026 source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Rheumatoid Factor, Quant Lab6262 | $65.65 | $131.30 | — | 50% | Apr 1, 2026 source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Rheumatoid Factor, Quant Lab6263 | $73.70 | $147.40 | — | 50% | Apr 1, 2026 source file |
Outpatient: lowest $12.86, median $29.71, highest $52.80 — a 4.1× difference within the same market.
As an inpatient, the same code is billed by 14 facilities here, median $29.71. 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 7 of 9 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 it is 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 it is
Rheumatoid factor is an antibody found in many people with rheumatoid arthritis. The test is part of the workup for joint pain and swelling.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.