Free T4 test cost in Idaho
In Idaho, 9 hospitals publish a cash price for free T4 (free thyroxine) thyroid blood test: from $37.05 to $56.25, with a median of $40.00. The lowest price is at Saint Alphonsus Medical Center - Nampa (Nampa) and 1 other hospital. The highest price is 1.5× the lowest.
Outpatient cash prices, one line per hospital — its lowest listed price for code 84439. Prices for both sides of the body and inpatient prices are not mixed in. Collected Sep 23, 2026.
Hospitals in Idaho, cheapest first
| Hospital | Cash price | List price | File date |
|---|---|---|---|
| Saint Alphonsus Medical Center - Nampa lowest Nampa · Boise City, ID HC T4 (Thyroxine) Free | $37.05 | $57.00 | Mar 31, 2026 source file |
| Saint Alphonsus Regional Medical Center - Boise lowest Boise · Boise City, ID HC T4 (Thyroxine) Free | $37.05 | $57.00 | Mar 31, 2026 source file |
| St Luke's Magic Valley Regional Medical Center Twin Falls · Twin Falls, ID | $40.00 | $40.00 | — source file |
| St Luke's McCall McCall · McCall, ID | $40.00 | $40.00 | — source file |
| St Luke's Nampa Medical Center Nampa · Boise City, ID | $40.00 | $40.00 | — source file |
| St Luke's Regional Medical Center Boise · Boise City, ID | $40.00 | $40.00 | — source file |
| St Luke's Wood River Medical Center Ketchum · Hailey, ID | $40.00 | $40.00 | — source file |
| Bingham Memorial Hospital Blackfoot · Blackfoot, ID Thyroxine (thyroid chemical), free | $40.08 | $57.25 | Feb 2, 2026 source file |
| Kootenai Health Coeur D'Alene · Coeur d'Alene, ID HC T4 (THYROXINE), FREE, S (REF LAB) | $56.25 | $75.00 | Mar 27, 2026 source file |
By metro area
Each metro page compares every listing, including prices for both sides of the body.
| Metro area | Hospitals | Lowest | Median |
|---|---|---|---|
| Boise City, ID | 4 | $37.05 | $38.52 |
| Blackfoot, ID | 1 | $40.08 | $40.08 |
| Coeur d'Alene, ID | 1 | $56.25 | $56.25 |
| Hailey, ID | 1 | $40.00 | $40.00 |
| McCall, ID | 1 | $40.00 | $40.00 |
| Twin Falls, ID | 1 | $40.00 | $40.00 |
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.
Free T4 (free thyroxine) thyroid blood test in other states
- Alabama$74.96
- Alaska$68.40
- Arizona$17.45
- Arkansas$48.10
- California$68.12
- Colorado$49.00
- Connecticut$55.55
- Delaware$157.92
- Florida$70.60
- Georgia$137.67
- Hawaii$44.40
- Illinois$82.08
- Indiana$72.25
- Iowa$61.18
- Kansas$109.75
- Kentucky$113.03
- Louisiana$37.66
- Maine$55.38
- Maryland$44.06
- Massachusetts$43.62
- Michigan$37.00
- Minnesota$65.27
- Mississippi$24.48
- Missouri$87.90
- Montana$51.20
- Nebraska$63.84
- Nevada$65.41
- New Hampshire$78.53
- New Jersey$10.37
- New Mexico$125.20
- New York$48.47
- North Carolina$78.40
- North Dakota$32.13
- Ohio$40.30
- Oklahoma$61.33
- Oregon$44.25
- Pennsylvania$63.90
- Puerto Rico$18.00
- Rhode Island$72.00
- South Carolina$105.00
- South Dakota$64.80
- Tennessee$27.50
- Texas$39.51
- Utah$84.43
- Vermont$114.00
- Virginia$57.00
- Washington$63.84
- West Virginia$45.75
- Wisconsin$70.85
- Wyoming$18.62
Median cash price across the state's hospitals.