Free T4 test cost in Seattle, WA
In Seattle-Tacoma-Bellevue, WA, 15 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test: from $13.61 to $141.60, with a median of $56.79. The lowest listed price is at Overlake Medical Center & Clinics — $43.18 less than the median here. Across Washington, the median is $63.84 at 33 hospitals.
Cash prices at 15 facilities across 12 cities for code 84439, 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 T4, Free-Lc | $13.61 | $27.22 | — | 50% | Apr 1, 2026 source file |
| Virginia Mason Medical Center Seattle, WA · (206) 223-6600 THYROXINE FREE (FT-4) | $36.72 | $72.00 | $43.20–$57.60 | 49% | — source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Assay Of Free Thyroxine | $39.00 | $78.00 | — | 50% | Apr 1, 2026 source file |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC FREE T4 REFLEX | $46.33 | $160.71 | $9.02–$120.54 | 71% | Feb 28, 2026 source file |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC FREE T4 REFLEX | $48.88 | $160.71 | $9.02–$120.54 | 70% | Feb 28, 2026 source file |
| Highline Medical Center Burien, WA · (206) 431-5237 HC FREE T4 REFLEX | $49.08 | $160.71 | $9.02–$144.64 | 69% | Feb 28, 2026 source file |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC FREE T4 REFLEX | $50.44 | $160.71 | $9.02–$120.54 | 69% | Feb 28, 2026 source file |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC FREE T4 REFLEX | $53.23 | $160.71 | $9.02–$120.54 | 67% | Feb 28, 2026 source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Free T4 By Dialysis/Mass Spec | $55.50 | $111.00 | — | 50% | Apr 1, 2026 source file |
| Enumclaw Regional Hospital Association Enumclaw, WA HC FREE T4 REFLEX | $56.79 | $160.71 | $9.02–$144.64 | 65% | Feb 28, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF FREE THYROXINE CDM | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF FREE THYROXINE LAB | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF FREE THYROXINE LAB | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF FREE THYROXINE CDM | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC ASSAY OF FREE THYROXINE CDM | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC ASSAY OF FREE THYROXINE LAB | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC ASSAY OF FREE THYROXINE CDM | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC ASSAY OF FREE THYROXINE LAB | $63.84 | $133.00 | — | 52% | Apr 1, 2026 source file |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC ASSAY OF FREE THYROXINE LAB | $69.16 | $133.00 | — | 48% | Apr 1, 2026 source file |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC ASSAY OF FREE THYROXINE CDM | $69.16 | $133.00 | — | 48% | Apr 1, 2026 source file |
| Kaiser Permanente Central Hospital Seattle, WA · (206) 326-3000 THYROXINE FREE | $92.00 | $115.00 | $7.00–$25.00 | 20% | Apr 1, 2026 source file |
| Cascade Valley Hospital Arlington, WA · (360) 435-2133 HC THYROXINE, FREE | $116.00 | $145.00 | $9.47–$116.00 | 20% | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 T4 Free by Equilibrium Dialys | $141.60 | $141.60 | $35.68–$135.94 | — | — source file |
Outpatient: lowest $13.61, median $56.79, highest $141.60 — a 10.4× difference within the same market.
As an inpatient, the same code is billed by 15 facilities here, median $56.79. 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 10 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
A free T4 test measures thyroxine that is not bound to proteins, the active form of the main thyroid hormone. It is usually ordered with or after a TSH test to check for an underactive or overactive thyroid and to adjust thyroid medicine.
What the price covers
The price usually covers the free T4 test only. The blood draw and the TSH test (84443) are billed separately.