Partial thromboplastin time (PTT) clotting test in San Francisco-Oakland-Fremont, CA
In San Francisco-Oakland-Fremont, CA, 12 hospitals list a cash price for Partial thromboplastin time (PTT) clotting test: from $4.94 to $259.00, with a median of $126.44. The lowest listed price is at Stanford Health Care Tri-Valley.
Cash prices at 12 facilities across 11 cities for code 85730, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Feb 23, 2026 and Jul 22, 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 Inhibitor Assay, Ptt | $4.94 | $12.35 | 60% | Apr 1, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA Ptt Inhibitor Scr-85730 | $5.01 | $12.53 | 60% | Apr 1, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA Partial Thromboplastin Time | $5.82 | $14.55 | 60% | Apr 1, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA Thromboplastin Time Partial | $14.00 | $35.00 | 60% | Apr 1, 2026 source file |
| Hayward Sisters Hospital Hayward, CA THROMBOPLASTINTIMEPART(PTT) | $30.87 | $102.90 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA THROMBOPLASTINTIMEPARTIAL | $30.87 | $102.90 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA LC THROMBOPLASTIN TIME PARTIAL | $35.74 | $119.13 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA LC-THROMBIN TIME PARTIAL | $38.66 | $128.87 | 70% | Feb 23, 2026 source file |
| Hayward Sisters Hospital Hayward, CA WHS-APTT | $61.13 | $203.78 | 70% | Feb 23, 2026 source file |
| Stanford Health Care Tri-Valley Pleasanton, CA HC Thromplas Ptt | $111.20 | $278.00 | 60% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - South San Francisco South San Francisco, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Rafael San Rafael, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Leandro San Leandro, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - San Francisco San Francisco, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - Redwood City Redwood City, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - Oakland/Richmond Oakland, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - Fremont Fremont, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - Antioch Antioch, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Kaiser Foundation Hospital - Walnut Creek Walnut Creek, CA THROMBOPLASTIN TIME PARTIAL PLASMA/WHOLE BLOOD | $141.68 | $253.00 | 44% | — source file |
| Chinese Hospital Association San Francisco, CA Coagulation assessment blood test, plasma or whole blood | $259.00 | $259.00 | — | Jul 22, 2026 source file |
Outpatient: lowest $4.94, median $126.44, highest $259.00 — a 52.4× difference within the same market.
As an inpatient, the same code is billed by 11 facilities here, median $141.68. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
What it is
The partial thromboplastin time (PTT or aPTT) test measures how long it takes blood to clot through a different pathway than the PT test. It is used to check for bleeding disorders, before surgery, and to monitor heparin.
What the price covers
The price usually covers the PTT test. The blood draw is often billed separately.
2 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 85730 ($48.56). 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 THROMBOPL TIME PART PLSMA | $3.22 | file |
| Stanford Health Care Tri-Valley Pleasanton, CAPtt-D | $4.69 | file |