Prothrombin time (PT/INR) clotting test in San Francisco-Oakland-Fremont, CA — inpatient
In San Francisco-Oakland-Fremont, CA, 11 hospitals list a cash price for Prothrombin time (PT/INR) clotting test as an inpatient: from $4.69 to $142.00, with a median of $89.60. The lowest listed price is at Stanford Health Care Tri-Valley.
Cash prices at 11 facilities across 11 cities for code 85610, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Feb 23, 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 | Off list | File date |
|---|---|---|---|---|
| Stanford Health Care Tri-Valley lowest Pleasanton, CA PT-D | $4.69 | $11.73 | 60% | Apr 1, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA Prothrombin Time | $5.82 | $14.55 | 60% | Apr 1, 2026 source file |
| Hayward Sisters Hospital Hayward, CA WHS-PT INR | $7.88 | $26.25 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA LC-PT MIXING STUDY | $18.91 | $63.02 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA PROTIME | $29.93 | $99.75 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA PROTHROMBINTIMESERIES | $29.93 | $99.75 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA LC-PROTHROMBIN TIME | $38.66 | $128.88 | 70% | Feb 23, 2026 source file |
| Kaiser Foundation Hospital - South San Francisco South San Francisco, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - Walnut Creek Walnut Creek, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - Oakland/Richmond Oakland, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - Fremont Fremont, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - Antioch Antioch, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Francisco San Francisco, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Leandro San Leandro, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Rafael San Rafael, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Kaiser Foundation Hospital - Redwood City Redwood City, CA PROTHROMBIN TIME | $89.60 | $160.00 | 44% | — source file |
| Stanford Health Care Tri-Valley Pleasanton, CA Labaclpt Prothrombin Time | $142.00 | $355.00 | 60% | Apr 1, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA HC Prothrombin Time | $142.00 | $355.00 | 60% | Apr 1, 2026 source file |
Inpatient: lowest $4.69, median $89.60, highest $142.00 — a 30.3× difference within the same market.
As an outpatient, the same code is billed by 12 facilities here, median $89.60 — that is the price to compare if you are not being admitted.
What it is
The prothrombin time (PT) test measures how long it takes blood to clot, and is reported with the INR, a standardized number. It is used to monitor warfarin and to check clotting before surgery or with liver disease.
What the price covers
The price usually covers the PT and INR result. The blood draw is often a separate charge; a fingerstick home or clinic INR check may be billed differently.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 85610 ($32.92). 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.
| Hayward Sisters Hospital Hayward, CALC PROTHROMBIN TIME | $3.22 | file |