Free T4 test cost in Jacksonville, FL
In Jacksonville, FL, 10 hospitals list a cash price for Free T4 (free thyroxine) thyroid blood test: from $44.00 to $162.44, with a median of $128.95. The lowest listed price is at University of Florida Health in Jacksonville — $84.95 less than the median here. Across Florida, the median is $70.60 at 81 hospitals.
Cash prices at 10 facilities across 6 cities for code 84439, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 24, 2026; the hospital files themselves were last updated between Feb 6, 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 Jacksonville, FL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| University of Florida Health in Jacksonville lowest Jacksonville, FL HB FREE T4 | $44.00 | $80.00 | $7.33–$10.55 | 45% | Mar 31, 2026 source file |
| University of Florida Health in Jacksonville Jacksonville, FL HB FREE T4-THYROXINE | $87.77 | $159.58 | $7.33–$10.55 | 45% | Mar 31, 2026 source file |
| Reunion Rehabilitation Hospital Jacksonville, LLC Jacksonville, FL Assay of thyroid (t4) | $103.02 | $103.02 | — | — | Apr 1, 2026 source file |
| St Vincents Health System Inc Saint Johns, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| St. Luke's-St. Vincent's Healthcare, Inc. Jacksonville, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| St. Vincent's Medical Center, Inc. (FL) Jacksonville, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$128.94 | 63% | — source file |
| St. Vincent's Medical Center, Inc. (FL) Jacksonville, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$128.94 | 63% | — source file |
| St. Vincent's Medical Center-Clay County, Inc. Middleburg, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| St. Luke's-St. Vincent's Healthcare, Inc. Jacksonville, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| St. Vincent's Medical Center-Clay County, Inc. Middleburg, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| St Vincents Health System Inc Saint Johns, FL FREE THYROXINE | $128.95 | $348.50 | $7.94–$348.50 | 63% | — source file |
| Southern Baptist Hospital of Florida, INC Fleming Island, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $52.40–$256.76 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of Nassau, INC Fernandina Beach, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $75.98–$256.76 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida, INC Jacksonville, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $6.66–$983.45 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida, INC Jacksonville, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $52.40–$256.76 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida, INC Jacksonville, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $55.02–$256.76 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of the Beaches, INC S Jacksonville Beach, FL HC ASSAY OF FREE THYROXINE - T4 FREE | $162.44 | $262.00 | $52.40–$256.76 | 38% | Feb 6, 2026 source file |
Outpatient: lowest $44.00, median $128.95, highest $162.44 — a 3.7× difference within the same market.
As an inpatient, the same code is billed by 6 facilities here, median $128.95. 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 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 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.