TPO antibody test cost in Santa Rosa, CA
In Santa Rosa-Petaluma, CA, 3 hospitals list a cash price for thyroid peroxidase (TPO) antibody test: from $30.57 to $63.28, with a median of $30.57. The lowest listed price is at Providence Santa Rosa Memorial Hospital and 1 other hospital. Across California, the median is $22.88 at 91 hospitals.
Cash prices at 3 facilities across 2 cities for code 86376, 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 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 Santa Rosa-Petaluma, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Providence Santa Rosa Memorial Hospital lowest Santa Rosa, CA · (707) 525-5300 HC MICROSOMAL ANTIBODIES EACH LAB | $30.57 | $59.95 | — | 49% | Apr 1, 2026 source file |
| Petaluma Valley Hospital lowest Petaluma, CA · (707) 778-1111 HC MICROSOMAL ANTIBODIES EACH LAB | $30.57 | $59.95 | — | 49% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - Santa Rosa Santa Rosa, CA · (707) 571-4000 MICROSOMAL ANTIBODIES EACH | $63.28 | $113.00 | $13.00–$40.00 | 44% | — source file |
Outpatient: lowest $30.57, median $30.57, highest $63.28 — a 2.1× difference within the same market.
As an inpatient, the same code is billed by 3 facilities here, median $30.57. 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 the one hospital here that publishes insurer rates for this code, the cash price is not below the highest rate a health plan has negotiated. 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
The TPO antibody test looks for antibodies against a thyroid enzyme. They are found in most people with Hashimoto's thyroiditis and many with Graves' disease.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
4 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 86376 ($65.00). 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.
| Providence Santa Rosa Memorial Hospital Santa Rosa, CAHC MICROSOMAL ANTIBODY | $2.49 | file |
| Petaluma Valley Hospital Petaluma, CAHC MICROSOMAL ANTIBODY | $2.49 | file |
| Providence Santa Rosa Memorial Hospital Santa Rosa, CAHC MICROSOMAL ANTIBODIES EACH CDM | $2.55 | file |
| Petaluma Valley Hospital Petaluma, CAHC MICROSOMAL ANTIBODIES EACH CDM | $2.55 | file |