TPO antibody test cost in California

In California, 184 hospitals publish a cash price for thyroid peroxidase (TPO) antibody test: from $5.46 to $185.00, with a median of $22.88. The lowest price is at Mercy Medical Center (Merced). The highest price is 33.9× the lowest.

• The median here, $22.88, is 64% below the US median of $63.84.
• That is 1.6× Medicare's 2026 national rate for the same service ($14.55).
• California ranks 4th of 51 states by median, cheapest first.
• 59 of 184 hospitals list a cash price equal to their full list price, with no self-pay discount.

California law (Health and Safety Code §127405): if you are uninsured or have high medical costs and your family income is at or below 400% of the federal poverty level, a hospital may not expect you to pay more than it would expect from Medicare or Medi-Cal, whichever is greater. That can be less than the cash prices below; ask the hospital for its discount payment policy. A separate physician fee may still apply. Other states' laws.

Outpatient cash prices, one line per hospital — its lowest listed price for code 86376. Prices for both sides of the body and inpatient prices are not mixed in. Collected Nov 8, 2026. See them on a map