Free T4 test cost in Riverside, CA
In Riverside-San Bernardino-Ontario, CA, 15 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test: from $6.84 to $283.12, with a median of $29.39. The lowest listed price is at Riverside University Medical Center — $22.55 less than the median here. Across California, the median is $68.12 at 104 hospitals.
Cash prices at 15 facilities across 13 cities for code 84439, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Sep 17, 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 Riverside-San Bernardino-Ontario, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Riverside University Medical Center lowest Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 Rflx From Tsh | $6.84 | $6.84 | $5.13–$11.13 | — | — source file |
| Riverside University Medical Center lowest Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 Index to T7 | $6.84 | $6.84 | $5.13–$11.13 | — | — source file |
| Riverside University Medical Center lowest Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 Index to T7 | $6.84 | $6.84 | $5.13–$11.13 | — | — source file |
| Riverside University Medical Center lowest Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 Rflx From Tsh | $6.84 | $6.84 | $5.13–$11.13 | — | — source file |
| Chino Valley Medical Center Chino, CA · (909) 627-6111 Hc Assay Of Free Thyroxine | $9.00 | $341.48 | $8.57–$341.48 | 97% | Sep 1, 2026 source file |
| Desert Valley Hospital Victorville, CA · (760) 241-8000 THYROXINE (T-4) FREE | $9.00 | $172.00 | $8.93–$172.00 | 95% | Sep 1, 2026 source file |
| Montclair Hospital Medical Center Montclair, CA · (909) 625-8300 Hc Assay Of Free Thyroxine | $9.00 | $341.48 | $8.57–$341.48 | 97% | Sep 1, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 by Equilibrium Dialys | $25.72 | $25.72 | $6.33–$25.72 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Lab Ref Free T4 by Equilibrium Dialys | $25.72 | $25.72 | $6.33–$25.72 | — | — source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.88–$93.05 | — | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $9.02–$23.51 | — | Aug 31, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.88–$91.17 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.32–$85.59 | — | Sep 2, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu T4 Free Direct Dialysis | $34.58 | $34.58 | $6.33–$34.58 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu T4 Free Direct Dialysis | $34.58 | $34.58 | $6.33–$34.58 | — | — source file |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC ASSAY OF FREE THYROXINE CDM | $52.56 | $109.50 | — | 52% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - Moreno Valley Moreno Valley, CA · (951) 251-6530 ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Riverside Riverside, CA · (951) 353-2000 ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Fontana Fontana, CA · (909) 427-5000 ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC FREE T4 BY EIA | $121.50 | $270.00 | $9.02–$216.00 | 55% | Aug 31, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC FREE T4 BY EIA | $121.50 | $270.00 | $9.02–$202.50 | 55% | Sep 2, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC FREE T4 BY EIA | $121.50 | $270.00 | $7.31–$229.50 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC FREE T4 BY EIA | $121.50 | $270.00 | $7.31–$243.00 | 55% | Sep 2, 2026 source file |
| San Antonio Regional Hospital Upland, CA · (909) 985-2811 Thyroxine (thyroid chemical), free | $185.00 | $532.00 | $7.22–$977.55 | 65% | Apr 2, 2026 source file |
| Hospital of Barstow Barstow, CA · (760) 256-1761 Thyroxine (thyroid chemical), free | $229.89 | $383.15 | $10.34–$306.52 | 40% | Sep 17, 2026 source file |
| Palo Verde Hospital Blythe, CA · (760) 922-4115 Thyroxine (T4) Free Direct LC | $283.12 | $377.50 | — | 25% | Jul 1, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Thyroxine Free | $498.93 | $498.93 | $6.33–$498.93 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Thyroxine Free | $498.93 | $498.93 | $6.33–$498.93 | — | — source file |
Outpatient: lowest $6.84, median $29.39, highest $283.12 — a 41.4× difference within the same market.
As an inpatient, the same code is billed by 10 facilities here, median $40.98. 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 9 of 13 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.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 84439 ($60.00). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.
| St Mary Medical Center Apple Valley, CAHC ASSAY OF FREE THYROXINE LAB | $4.80 | file |