Total T4 test cost in San Francisco, CA — inpatient
In San Francisco-Oakland-Fremont, CA, 21 hospitals list a cash price for total thyroxine (T4) blood test as an inpatient: from $39.20 to $118.00, with a median of $118.00. The lowest listed price is at Kaiser Foundation Hospital - San Rafael and 8 other hospitals — $78.80 less than the median here. Across California, the median is $39.20 at 185 hospitals.
Cash prices at 21 facilities across 15 cities for code 84436, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Apr 1, 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 Francisco-Oakland-Fremont, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Kaiser Foundation Hospital - San Rafael lowest San Rafael, CA · (415) 444-2000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Leandro lowest San Leandro, CA · (510) 454-1000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - Antioch lowest Antioch, CA · (925) 813-6500 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - South San Francisco lowest South San Francisco, CA · (650) 742-3200 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - Walnut Creek lowest Walnut Creek, CA · (925) 295-4000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Francisco lowest San Francisco, CA · (415) 833-2646 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - Redwood City lowest Redwood City, CA · (650) 299-2000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - Fremont lowest Fremont, CA · (510) 784-4000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Kaiser Foundation Hospital - Oakland/Richmond lowest Oakland, CA · (510) 752-1000 ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Stanford Health Care Tri-Valley Pleasanton, CA · (925) 847-3000 HC Thyroxine(T4) Total | $42.40 | $106.00 | — | 60% | Apr 1, 2026 source file |
| Novato Community Hospital Novato, CA · (415) 209-1300 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Sutter Delta Medical Center Antioch, CA · (925) 779-7200 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center-Summit Campus-Hawthorne Oakland, CA · (510) 655-4000 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Mills Health Center San Mateo, CA · (650) 696-5400 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center Oakland, CA · (510) 655-4000 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| California Pacific Medical Ctr-Davies Campus Hospital San Francisco, CA · (415) 600-6000 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Eden Medical Center Castro Valley, CA · (510) 537-1234 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center - Alta Bates Camp Berkeley, CA · (510) 204-4444 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| California Pacific Medical Center- Van Ness Campus San Francisco, CA · (415) 600-6000 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center - Herrick Campus Berkeley, CA · (510) 204-4444 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Mills-Peninsula Medical Center Burlingame, CA · (650) 696-5400 HCHG THYROXINE (T4) | $118.00 | $118.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center-Summit Campus-Hawthorne Oakland, CA · (510) 655-4000 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| California Pacific Medical Ctr-Davies Campus Hospital San Francisco, CA · (415) 600-6000 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center - Herrick Campus Berkeley, CA · (510) 204-4444 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Novato Community Hospital Novato, CA · (415) 209-1300 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center Oakland, CA · (510) 655-4000 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Mills-Peninsula Medical Center Burlingame, CA · (650) 696-5400 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Eden Medical Center Castro Valley, CA · (510) 537-1234 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Sutter Delta Medical Center Antioch, CA · (925) 779-7200 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Alta Bates Summit Medical Center - Alta Bates Camp Berkeley, CA · (510) 204-4444 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Mills Health Center San Mateo, CA · (650) 696-5400 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| California Pacific Medical Center- Van Ness Campus San Francisco, CA · (415) 600-6000 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
Inpatient: lowest $39.20, median $118.00, highest $118.00 — a 3.0× difference within the same market.
As an outpatient, the same code is billed by 22 facilities here, median $80.20 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 0 of 9 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 total T4 test measures all the thyroxine hormone in the blood, both bound and free. Most doctors now order free T4 (84439) instead, which is less affected by pregnancy and medicines.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
3 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84436 ($52.20). 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. Rose Hospital Hayward, CALC -Thyroxine (T4) | $1.62 | file |
| Sequoia Hospital Redwood City, CARL-A-FTIP 3005976B | $2.39 | file |
| Sequoia Hospital Redwood City, CARL-A-T4 TOTAL 3005978 | $2.58 | file |