Total T4 test cost in Louisville, KY
In Louisville/Jefferson County, KY-IN, 17 hospitals list a cash price for total thyroxine (T4) blood test: from $23.94 to $129.60, with a median of $45.20. The lowest listed price is at Norton Clark Hospital — $21.26 less than the median here. Across Kentucky, the median is $75.08 at 76 hospitals.
Cash prices at 17 facilities across 9 cities for code 84436, as an outpatient — the setting a self-pay patient normally buys. Collected Oct 2, 2026; the hospital files themselves were last updated between Feb 11, 2026 and Sep 25, 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 Louisville/Jefferson County, KY-IN.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Norton Clark Hospital lowest Jeffersonville, IN · (812) 283-2147 HB T4 TOTAL File of Jun 3, 2026 · source file | $23.94 | $171.00 | $5.84–$149.63 | 86% |
| University of Louisville Hospital Louisville, KY · (502) 562-3000 ASSAY OF TOTAL THYROXINE source file | $33.36 | $139.00 | $23.35–$139.00 | 76% |
| St. Vincent Salem Hospital Salem, IN · (812) 883-5881 #THYROXINE; TOTAL+1 more line at this price source file | $39.60 | $66.00 | $2.65–$15.66 | 40% |
| Saints Mary & Elizabeth Hospital Louisville, KY ASSAY OF TOTAL THYROXINE source file | $43.92 | $122.00 | $20.50–$122.00 | 64% |
| Norton Brownsboro Hospital Louisville, KY HB T4 TOTAL File of Feb 11, 2026 · source file | $45.20 | $226.00 | $6.87–$187.58 | 80% |
| Norton Hospital Louisville, KY · (502) 629-8000 HB T4 TOTAL File of Feb 11, 2026 · source file | $45.20 | $226.00 | $6.87–$187.58 | 80% |
| Norton Children's Hospital Louisville, KY HB T4 TOTAL File of Feb 11, 2026 · source file | $45.20 | $226.00 | $6.87–$192.10 | 80% |
| Norton Women's and Kosair Children's Hospital Louisville, KY HB T4 TOTAL File of Feb 13, 2026 · source file | $45.20 | $226.00 | $6.87–$187.58 | 80% |
| Norton West Louisville Hospital Louisville, KY HB T4 TOTAL File of Feb 11, 2026 · source file | $45.20 | $226.00 | $6.87–$187.58 | 80% |
| UofL Health -Shelbyville Shelbyville, KY · (502) 647-4000 ASSAY OF TOTAL THYROXINE source file | $66.50 | $175.00 | $23.43–$175.00 | 62% |
| UofL Health-Louisville – South Hospital Shepherdville, KY ASSAY OF TOTAL THYROXINE source file | $75.15 | $167.00 | $28.06–$167.00 | 55% |
| UofL Health - Jewish Hospital and Mary & Elizabeth Hospital Louisville, KY · (502) 587-4011 ASSAY OF TOTAL THYROXINE source file | $80.55 | $179.00 | $30.07–$179.00 | 55% |
| CHI Saint Joseph Flaget Memorial Hospital Bardstown, KY · (502) 350-5000 HC LAB T4 THYROXINE File of Feb 28, 2026 · source file | $85.71 | $202.00 | $5.84–$183.82 | 58% |
| Baptist Health Louisville Louisville, KY · (502) 897-8100 Thyroxine (thyroid chemical), total File of Sep 25, 2026 · source file | $87.38 | $116.50 | $4.12–$233.00 | 25% |
| Baptist Health LaGrange La Grange, KY · (502) 222-5388 Thyroxine (thyroid chemical), total File of Sep 25, 2026 · source file | $87.38 | $116.50 | $5.84–$233.00 | 25% |
| Baptist Health Floyd New Albany, IN · (812) 944-7701 Thyroxine (thyroid chemical), total File of Sep 25, 2026 · source file | $87.38 | $116.50 | $5.84–$174.75 | 25% |
| Harrison County Hospital Corydon, IN · (812) 738-4251 Thyroxine (thyroid chemical), total File of Jul 16, 2026 · source file | $129.60 | $216.00 | $3.44–$194.40 | 40% |
| St. Vincent Salem Hospital Salem, IN · (812) 883-5881 THYROXINE; TOTAL+1 more line at this price source file | $138.60 | $231.00 | $2.65–$15.66 | 40% |
Outpatient: lowest $23.94, median $45.20, highest $129.60 — a 5.4× difference within the same market.
As an inpatient, the same code is billed by 13 facilities here, median $45.20. 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 16 of 17 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.