Free T4 test cost in Sioux Falls, SD — inpatient
In Sioux Falls, SD-MN, 2 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test as an inpatient: from $60.80 to $67.20, with a median of $64.00. The lowest listed price is at Sanford Canton Inwood Medical Center — $3.20 less than the median here. Across South Dakota, the median is $64.80 at 6 hospitals.
Cash prices at 2 facilities across 2 cities for code 84439, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Mar 4, 2026 and Mar 4, 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 Sioux Falls, SD-MN.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Sanford Canton Inwood Medical Center lowest Canton, SD ASSAY OF FREE THYROXINE 84439 | $60.80 | $76.00 | $41.64–$68.40 | 20% | Mar 4, 2026 source file |
| Sanford Luverne Medical Center Luverne, MN ASSAY OF FREE THYROXINE 84439 | $67.20 | $84.00 | $45.01–$79.46 | 20% | Mar 4, 2026 source file |
| Sanford Luverne Medical Center Luverne, MN FREE T4 BY EQ DIALYSIS SO 84439.900 | $72.00 | $90.00 | $48.22–$85.14 | 20% | Mar 4, 2026 source file |
Inpatient: lowest $60.80, median $64.00, highest $67.20 — a 1.1× difference within the same market.
As an outpatient, the same code is billed by 2 facilities here, median $64.00 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 2 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.