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PricedCare

Partial thromboplastin time (blood clotting test) in San Francisco, CA costs $5 to $259. Here's every hospital's price.

7 hospitals in the San Francisco-Oakland-Fremont, CA metro area publish a cash price for partial thromboplastin time (blood clotting test) (CPT 85730). We read their files every month so you don't have to.

Across the San Francisco-Oakland-Fremont, CA metro area, 7 hospitals list a cash price for partial thromboplastin time (blood clotting test) (CPT 85730). The lowest is $5 at Stanford Health Care Tri-Valley, the median is $142 and the highest is $259 at Chinese Hospital. The most expensive hospital lists 55 times the cheapest for the same code.

The San Francisco, CA median of $142 is 396% above the national median of $29 across 581 US hospitals with a cash price for this code.

6 of these hospitals also publish the rates they negotiated with insurers, from $2 to $466. With insurance you pay a share of the negotiated rate, which is sometimes higher than the cash price; you may ask for the cash price instead.

The files behind these prices are dated between April 2026 and July 2026. 31 other hospitals in the metro area have no readable price for this code: some publish no file, some block automated reading, some leave the code out. They are listed below so you can call them.

$5
lowest cash price in San Francisco, CA
Stanford Health Care Tri-Valley · 22 mi
$137 below the median
$142
median cash price
7 hospitals
55×
highest ÷ lowest
same procedure, same metro
7/38
hospitals with a cash price
31 don't · see who

Sorted by cash price

Hospital facility fee only
1
Stanford Health Care Tri-Valley

Pleasanton · 22 mi · File Apr 2026

$5
list $12 · lowest of 14 lines
2
Washington Hospital

Fremont · 22 mi · File Apr 2026

$7
list $9 · lowest of 63 lines
3
UCSF Benioff Children's Hospital Oakland

Oakland · 4 mi · File Apr 2026

$12
list $40 · lowest of 7 lines
4
Kaiser Foundation Hospital - South San Francisco

South San Francisco · 12 mi · File Apr 2026

$142
list $253 · lowest of 2 lines
5
Kaiser Foundation Hospital - Fremont

Fremont · 22 mi · File Apr 2026

$142
list $253 · lowest of 2 lines
6
Kaiser Foundation Hospital - Antioch

Antioch · 30 mi · File Apr 2026

$142
list $253 · lowest of 6 lines
7
Chinese Hospital

San Francisco · 7 mi · File Jul 2026

$259
list $259
1

What's in the price

The hospital facility fee for CPT 85730. The doctor, anesthesia and lab work usually bill separately.

2

Cash vs. insured

Cash is what you pay without insurance. With insurance you pay a share of the negotiated rate, which can be higher than cash. You may ask for the cash price.

3

What to say on the phone

"I'd like the self-pay price for CPT 85730, in writing, and whether it covers facility, physician and anesthesia."

About partial thromboplastin time (blood clotting test)

CPT 85730 is a partial thromboplastin time (PTT or aPTT), a clotting test that checks a different part of the clotting cascade from prothrombin time. It is used to monitor heparin, to investigate unexplained bleeding or bruising, and before surgery. One blood draw.

What the price covers

The laboratory analysis only. The blood draw is a separate small charge. It is often ordered together with prothrombin time (85610); the two are separate codes and separate prices.

Why prices vary

The test runs on automated coagulation analyzers and costs a laboratory a few dollars. Hospital list prices range from under $10 to over $150 for the same result. Independent laboratories are typically far cheaper.

Questions to ask

  • What is the self-pay price for 85730, and is PT (85610) also being billed?
  • Is the blood draw extra?
  • Can the sample be sent to an outside laboratory?

Hospitals in San Francisco, CA without a price for this procedure

Listed so you know who to call. The reason is what we found on their website.

Questions people ask