Free T3 test cost in St. Louis, MO
In St. Louis, MO-IL, 11 hospitals list a cash price for free T3 thyroid hormone test: from $60.45 to $514.98, with a median of $123.50. The lowest listed price is at Mercy Hospital Washington and 2 other hospitals — $63.05 less than the median here. Across Missouri, the median is $117.00 at 29 hospitals.
Cash prices at 11 facilities across 9 cities for code 84481, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between — and —.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in St. Louis, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Hospital Washington lowest Washington, MO T3 Free | $60.45 | $93.00 | $6.05–$83.70 | 35% | — source file |
| Mercy Hospital St Louis lowest Saint Louis, MO T3 Free | $60.45 | $93.00 | $15.25–$38.12 | 35% | — source file |
| Mercy Hospital South lowest Saint Louis, MO · (314) 525-1000 T3 Free | $60.45 | $93.00 | $15.25–$38.12 | 35% | — source file |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 HC T3 FREE | $97.20 | $135.00 | $21.58–$135.00 | 28% | — source file |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL HC T3 FREE | $119.52 | $166.00 | $9.27–$166.00 | 28% | — source file |
| Shriners Childrens - St Louis Saint Louis, MO · (314) 432-3600 FREE ASSAY (FT-3) | $123.50 | $123.50 | $9.29–$29.11 | — | — source file |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 HC T3 FREE | $127.44 | $177.00 | $9.27–$177.00 | 28% | — source file |
| Mercy Hospital Jefferson Festus, MO T3 Free | $136.50 | $210.00 | $15.25–$38.12 | 35% | — source file |
| Mercy Hospital Lincoln Troy, MO · (636) 528-8551 T3 Free | $137.80 | $212.00 | $13.78–$212.00 | 35% | — source file |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 HC T3 FREE | $279.36 | $388.00 | $9.74–$388.00 | 28% | — source file |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 T3,FREE | $514.98 | $858.30 | $858.30 | 40% | — source file |
Outpatient: lowest $60.45, median $123.50, highest $514.98 — a 8.5× difference within the same market.
As an inpatient, the same code is billed by 7 facilities here, median $127.44. 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 11 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
Free T3 is the active thyroid hormone not bound to proteins. It is usually checked after TSH (84443) and free T4 (84439), mainly when an overactive thyroid is suspected.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.