Free T4 test cost in Boulder, CO — inpatient
In Boulder, CO, 1 hospital lists a cash price for free T4 (free thyroxine) thyroid blood test as an inpatient: from $158.93 to $158.93, with a median of $158.93. Across Colorado, the median is $49.00 at 17 hospitals.
Cash prices at 1 facility for code 84439, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 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 Boulder, CO.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| AdventHealth Avista lowest Louisville, CO · (303) 673-1000 HC T4 FREE - THYROXINE FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Avista lowest Louisville, CO · (303) 673-1000 HC T4 FREE BY DIALYSIS - ARUP | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Avista lowest Louisville, CO · (303) 673-1000 HC T4 FREE REFLEX FROM TSH CASCADE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Avista lowest Louisville, CO · (303) 673-1000 HC T4 FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
Inpatient: lowest $158.93, median $158.93, highest $158.93.
As an outpatient, the same code is billed by 1 facility here, median $158.93 — that is the price to compare if you are not being admitted.
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.