Total T4 test cost in San Antonio, TX
In San Antonio-New Braunfels, TX, 16 hospitals list a cash price for total thyroxine (T4) blood test: from $16.60 to $605.01, with a median of $605.01. The lowest listed price is at Guadalupe Regional Medical Center — $588.41 less than the median here. Across Texas, the median is $80.73 at 302 hospitals.
Cash prices at 16 facilities across 5 cities for code 84436, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Oct 14, 2025 and Sep 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 San Antonio-New Braunfels, TX.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Guadalupe Regional Medical Center lowest Seguin, TX · (830) 379-2411 THYROXINE; TOTAL | $16.60 | $33.20 | $6.87–$50.88 | 50% | — source file |
| University Health System San Antonio, TX · (210) 358-2000 HC ASSAY OF TOTAL THYROXINE - T4 (THYROID HORMONE) | $18.25 | $73.00 | $5.77–$182.50 | 75% | Oct 14, 2025 source file |
| Guadalupe Regional Medical Center Seguin, TX · (830) 379-2411 THYROXINE; TOTAL T4 | $31.00 | $62.00 | $6.87–$62.00 | 50% | — source file |
| Medina Regional Hospital Hondo, TX · (830) 426-7700 T4 (THYROXINE) | $38.26 | $42.51 | $10.20–$42.51 | 10% | Jul 29, 2026 source file |
| Medina Regional Hospital Hondo, TX · (830) 426-7700 T4 TOTAL | $62.33 | $69.25 | $10.99–$69.25 | 10% | Jul 29, 2026 source file |
| Santa Rosa Hospital - Westover Hills San Antonio, TX · (210) 703-8211 HC 84436 ASSAY OF TOTAL THYROXINE | $68.97 | $209.00 | $2.41–$198.55 | 67% | Jan 13, 2026 source file |
| Warm Springs Rehabilitation Hospital of San Antonio San Antonio, TX Total Thyroxine | $229.05 | $229.05 | $4.81–$206.15 | — | Aug 6, 2026 source file |
| Methodist Hospital Landmark San Antonio, TX · (210) 638-2101 THYROXINE T4 TOTAL | $605.01 | $605.01 | $148.83–$514.26 | — | Sep 1, 2026 source file |
| Methodist Hospital Westover Hills San Antonio, TX · (210) 638-2101 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Hospital Westover Hills San Antonio, TX · (210) 638-2101 THYROXINE T4 TOTAL | $605.01 | $605.01 | $148.83–$514.26 | — | Sep 1, 2026 source file |
| Methodist Hospital Atascosa Jourdanton, TX · (830) 769-3515 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Hospital Helotes, TX · (210) 575-4000 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Hospital Stone Oak San Antonio, TX · (210) 638-2101 Thyroxine; total | $605.01 | $605.01 | $5.77 | — | Sep 1, 2026 source file |
| Methodist Hospital Stone Oak San Antonio, TX · (210) 638-2101 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Methodist Texsan Hospital Rehab San Antonio, TX Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Texsan Hospital Rehab San Antonio, TX THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Metropolitan Methodist San Antonio, TX · (210) 575-4000 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Metropolitan Methodist San Antonio, TX · (210) 575-4000 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Stone Oak Rehab San Antonio, TX Thyroxine; total | $605.01 | $605.01 | $5.77 | — | Sep 1, 2026 source file |
| Stone Oak Rehab San Antonio, TX THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Northeast Methodist San Antonio, TX · (210) 638-2101 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Northeast Methodist San Antonio, TX · (210) 638-2101 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Methodist Hospital Atascosa Jourdanton, TX · (830) 769-3515 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Methodist Hospital Helotes, TX · (210) 575-4000 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$605.01 | — | Sep 1, 2026 source file |
| Methodist Specialty and Transplant San Antonio, TX · (210) 575-4000 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Specialty and Transplant San Antonio, TX · (210) 575-4000 THYROXINE T4 TOTAL | $605.01 | $605.01 | $405.36 | — | Sep 1, 2026 source file |
| Methodist Texsan Hospital San Antonio, TX · (210) 638-2101 Thyroxine; total | $605.01 | $605.01 | $5.77–$6.87 | — | Sep 1, 2026 source file |
| Methodist Texsan Hospital San Antonio, TX · (210) 638-2101 THYROXINE T4 TOTAL | $605.01 | $605.01 | $30.25–$514.26 | — | Sep 1, 2026 source file |
| Methodist Hospital Landmark San Antonio, TX · (210) 638-2101 Thyroxine; total | $605.01 | $605.01 | $5.77 | — | Sep 1, 2026 source file |
Outpatient: lowest $16.60, median $605.01, highest $605.01 — a 36.4× difference within the same market.
As an inpatient, the same code is billed by 5 facilities here, median $38.26. 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 16 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 it is
A total T4 test measures all the thyroxine hormone in the blood, both bound and free. Most doctors now order free T4 (84439) instead, which is less affected by pregnancy and medicines.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.