Free T4 test cost in Denver, CO — inpatient
In Denver-Aurora-Centennial, CO, 10 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test as an inpatient: from $18.41 to $335.95, with a median of $130.98. The lowest listed price is at Denver Health and Hospital Authority — $112.57 less than the median here. Across Colorado, the median is $49.00 at 17 hospitals.
Cash prices at 10 facilities across 6 cities 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 Jun 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 Denver-Aurora-Centennial, CO.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Denver Health and Hospital Authority lowest Denver, CO HC THYROXINE FREE STANDOUT | $18.41 | $52.58 | $18.03 | 65% | Apr 30, 2026 source file |
| Denver Health and Hospital Authority Denver, CO HC FREE T4 (FT4) | $32.18 | $91.93 | $31.53 | 65% | Apr 30, 2026 source file |
| Denver Health and Hospital Authority Denver, CO HC THYROXINE, FREE BY EQUILIBRIUM DIALYSIS/HPLC-TANDEM MASS SPECTROMETRY ARUP 0093244 | $42.56 | $121.59 | $41.71 | 65% | Apr 30, 2026 source file |
| Denver Health and Hospital Authority Denver, CO HC FREE T4 BY EQUIL DIALYSIS-TMS | $45.28 | $129.36 | $44.37 | 65% | Apr 30, 2026 source file |
| Childrens Hospital Colorado Aurora, CO HB=CSHB T4 FREE BY DIALYSIS | $48.10 | $74.00 | $11.10–$68.08 | 35% | Apr 17, 2026 source file |
| National Jewish Health Denver, CO HC FREE THYROXINE | $49.00 | $70.00 | $9.02–$59.50 | 30% | — source file |
| Childrens Hospital Colorado Aurora, CO HB=T4 FREE DIRECT DIALYSIS S-MAYO | $59.80 | $92.00 | $13.80–$84.64 | 35% | Apr 17, 2026 source file |
| Childrens Hospital Colorado Aurora, CO HB=T4 FREE DIALYSIS | $81.90 | $126.00 | $18.90–$115.92 | 35% | Apr 17, 2026 source file |
| Childrens Hospital Colorado Aurora, CO HB=FREE T4 BY EQUIL DIALYSIS TMS-ARUP | $95.55 | $147.00 | $22.05–$135.24 | 35% | Apr 17, 2026 source file |
| Reunion Rehabilitation Hospital Inverness, LLC Englewood, CO Assay of thyroid (t4) | $103.02 | $103.02 | — | — | Apr 1, 2026 source file |
| Denver Rehabilitation Hospital, LLC Denver, CO Assay of thyroid (t4) | $103.02 | $103.02 | — | — | Apr 1, 2026 source file |
| Childrens Hospital Colorado Aurora, CO HB=T4 FREE | $104.65 | $161.00 | $24.15–$148.12 | 35% | Apr 17, 2026 source file |
| Childrens Hospital Colorado Aurora, CO HB=CSHB FREE T4 | $119.60 | $184.00 | $27.60–$169.28 | 35% | Apr 17, 2026 source file |
| AdventHealth Parker Parker, CO HC T4 FREE - THYROXINE FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Parker Parker, CO HC T4 FREE BY DIALYSIS - ARUP | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Parker Parker, CO HC T4 FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Parker Parker, CO HC T4 FREE REFLEX FROM TSH CASCADE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Littleton Littleton, CO HC T4 FREE - THYROXINE FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Littleton Littleton, CO HC T4 FREE BY DIALYSIS - ARUP | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Littleton Littleton, CO HC T4 FREE REFLEX FROM TSH CASCADE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Littleton Littleton, CO HC T4 FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Porter Denver, CO HC T4 FREE - THYROXINE FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Porter Denver, CO HC T4 FREE BY DIALYSIS - ARUP | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Porter Denver, CO HC T4 FREE REFLEX FROM TSH CASCADE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Porter Denver, CO HC T4 FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Castle Rock Castle Rock, CO HC T4 FREE - THYROXINE FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Castle Rock Castle Rock, CO HC T4 FREE BY DIALYSIS - ARUP | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Castle Rock Castle Rock, CO HC T4 FREE REFLEX FROM TSH CASCADE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| AdventHealth Castle Rock Castle Rock, CO HC T4 FREE | $158.93 | $158.93 | — | — | Apr 1, 2026 source file |
| Craig Hospital Englewood, CO HC THYROXINE FREE (FT4) | $335.95 | $881.75 | $456.75–$793.58 | 62% | Jun 25, 2026 source file |
Inpatient: lowest $18.41, median $130.98, highest $335.95 — a 18.2× difference within the same market.
As an outpatient, the same code is billed by 10 facilities here, median $130.98 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 3 of 4 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
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.