Total T4 test cost in San Antonio, TX — inpatient
In San Antonio-New Braunfels, TX, 4 hospitals list a cash price for total thyroxine (T4) blood test as an inpatient: from $16.60 to $399.91, with a median of $28.26. The lowest listed price is at Guadalupe Regional Medical Center — $11.66 less than the median here. Across Texas, the median is $79.50 at 282 hospitals.
Cash prices at 4 facilities across 3 cities for code 84436, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Oct 14, 2025 and Aug 6, 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 |
|---|---|---|---|---|
| Guadalupe Regional Medical Center lowest Seguin, TX · (830) 379-2411 THYROXINE; TOTAL File of May 21, 2026 · source file | $16.60 | $33.20 | $6.87–$50.88 | 50% |
| University Health System San Antonio, TX · (210) 358-2000 HC ASSAY OF TOTAL THYROXINE - T4 (THYROID HORMONE) File of Oct 14, 2025 · source file | $18.25 | $73.00 | $27.01–$62.05 | 75% |
| Guadalupe Regional Medical Center Seguin, TX · (830) 379-2411 THYROXINE; TOTAL File of May 21, 2026 · source file | $24.00 | $48.00 | $6.87–$50.88 | 50% |
| Guadalupe Regional Medical Center Seguin, TX · (830) 379-2411 THYROXINE; TOTAL T4+1 more line at this price File of May 21, 2026 · source file | $31.00 | $62.00 | $6.87–$62.00 | 50% |
| Medina Regional Hospital Hondo, TX · (830) 426-7700 T4 (THYROXINE) File of Jul 29, 2026 · source file | $38.26 | $42.51 | $21.26–$38.26 | 10% |
| Medina Regional Hospital Hondo, TX · (830) 426-7700 T4 TOTAL File of Jul 29, 2026 · source file | $62.33 | $69.25 | $34.63–$62.33 | 10% |
| Specialty Hospital of San Antonio Medical Center South San Antonio, TX Total Thyroxine File of Aug 6, 2026 · source file | $399.91 | $399.91 | $279.94–$359.92 | — |
Inpatient: lowest $16.60, median $28.26, highest $399.91 — a 24.1× difference within the same market.
As an outpatient, the same code is billed by 13 facilities here, median $605.01 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 4 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 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.