Free T4 test cost in San Jose, CA
In San Jose-Sunnyvale-Santa Clara, CA, 5 hospitals list a cash price for Free T4 (free thyroxine) thyroid blood test: from $10.80 to $102.48, with a median of $43.00. The lowest listed price is at Stanford Health Care — $32.20 less than the median here. Across California, the median is $68.12 at 104 hospitals.
Cash prices at 5 facilities across 5 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 Mar 31, 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 San Jose-Sunnyvale-Santa Clara, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Stanford Health Care lowest Stanford, CA HC 6959 Free T4 Equilib Dialysis | $10.80 | $27.00 | — | 60% | Apr 1, 2026 source file |
| Stanford Health Care Stanford, CA Labft4ed Assay Thyroxine | $12.00 | $30.00 | — | 60% | Apr 1, 2026 source file |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA HC 100 Free T4 Equilib Dialysis | $13.50 | $27.00 | $13.12 | 50% | Mar 31, 2026 source file |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA HC 6956 Labft4ed Assay Thyroxine | $15.00 | $30.00 | $14.58 | 50% | Mar 31, 2026 source file |
| El Camino Hospital Mountain View, CA HC FREE T4 | $43.00 | $172.00 | — | 75% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - San Jose San Jose, CA ASSAY OF FREE THYROXINE | $102.48 | $183.00 | $8.00–$25.00 | 44% | — source file |
| Kaiser Foundation Hospital - Santa Clara Santa Clara, CA ASSAY OF FREE THYROXINE | $102.48 | $183.00 | $8.00–$25.00 | 44% | — source file |
| Stanford Health Care Stanford, CA HC Free T4 | $230.00 | $575.00 | — | 60% | Apr 1, 2026 source file |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA HC Free T4 | $287.50 | $575.00 | $279.39 | 50% | Mar 31, 2026 source file |
Outpatient: lowest $10.80, median $43.00, highest $102.48 — a 9.5× difference within the same market.
As an inpatient, the same code is billed by 4 facilities here, median $72.74. 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 0 of 3 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.
| El Camino Hospital Mountain View, CAHC FREE T4 DIRECT SERUM*3 | $1.25 | file |