Free T4 test cost in Riverside, CA — inpatient
In Riverside-San Bernardino-Ontario, CA, 9 hospitals list a cash price for Free T4 (free thyroxine) thyroid blood test as an inpatient: 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 9 facilities across 8 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 Sep 2, 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 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 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 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 HC Lab Ref Free T4 Rflx From Tsh | $6.84 | $6.84 | $5.13–$11.13 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA 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 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 HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.88–$24.98 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.32–$22.04 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $5.88–$26.45 | — | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC SOM THYROXINE (T4), FREE | $29.39 | $29.39 | $16.16–$23.51 | — | Aug 31, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA HC Qu T4 Free Direct Dialysis | $34.58 | $34.58 | $6.33–$34.58 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA HC Qu T4 Free Direct Dialysis | $34.58 | $34.58 | $6.33–$34.58 | — | — source file |
| St Mary Medical Center Apple Valley, CA HC ASSAY OF FREE THYROXINE CDM | $52.56 | $109.50 | — | 52% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - Fontana Fontana, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Riverside Riverside, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Loma Linda University Childrens Hospital Loma Linda, CA HC FREE T4 BY EIA | $121.50 | $270.00 | $54.00–$229.50 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA HC FREE T4 BY EIA | $121.50 | $270.00 | $48.87–$202.50 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA HC FREE T4 BY EIA | $121.50 | $270.00 | $54.00–$243.00 | 55% | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC FREE T4 BY EIA | $121.50 | $270.00 | $148.50–$216.00 | 55% | Aug 31, 2026 source file |
| Palo Verde Hospital Blythe, CA Thyroxine (T4) Free Direct LC | $283.12 | $377.50 | — | 25% | Jul 1, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA HC Thyroxine Free | $498.93 | $498.93 | $6.33–$498.93 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA HC Thyroxine Free | $498.93 | $498.93 | $6.33–$498.93 | — | — source file |
Inpatient: lowest $6.84, median $29.39, highest $283.12 — a 41.4× difference within the same market.
As an outpatient, the same code is billed by 14 facilities here, median $29.39 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 1 of 7 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 |