Total T4 test cost in Modesto, CA
In Modesto, CA, 3 hospitals list a cash price for total thyroxine (T4) blood test: from $5.40 to $123.00, with a median of $39.20. The lowest listed price is at Oak Valley Hospital District — $33.80 less than the median here. Across California, the median is $39.20 at 185 hospitals.
Cash prices at 3 facilities across 2 cities for code 84436, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Jul 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 Modesto, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Oak Valley Hospital District lowest Oakdale, CA · (209) 847-3011 Thyroxine (thyroid chemical), total | $5.40 | $7.20 | $3.90–$7.56 | 25% | Jul 17, 2026 source file |
| Kaiser Foundation Hospital - Modesto Modesto, CA ASSAY OF THYROXINE TOTAL | $39.20 | $70.00 | $6.00–$20.00 | 44% | — source file |
| Memorial Medical Center Modesto, CA · (209) 526-4500 HCHG CORE THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
| Memorial Medical Center Modesto, CA · (209) 526-4500 HCHG THYROXINE (T4) | $123.00 | $123.00 | — | — | Apr 1, 2026 source file |
Outpatient: lowest $5.40, median $39.20, highest $123.00 — a 22.8× difference within the same market.
As an inpatient, the same code is billed by 2 facilities here, median $81.10. 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 1 of 2 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.