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Clotting-regulation Protein Blood Test, Protein S

Washington, DC rates for HCPCS 85306

This is a blood test that measures protein S, one of the body's natural proteins that helps keep blood clotting properly balanced. It's typically ordered as part of a work-up after an unexplained or recurrent blood clot, to check whether a deficiency in this protein might be a contributing factor. It's usually run together with a small set of related clot-regulation tests.

Rates data updated July 2026.

How much does Clotting-regulation Protein Blood Test, Protein S cost?

$27.54

Typical negotiated rate. In Washington, DC, July 2026.

Insurers have agreed to pay about $27.54 for this service. The price depends on where it is billed: about $11.48 from a physician practice, and about $89.13 from a hospital or other facility. The two figures are alternatives, not parts of one bill.

These are rates insurers have negotiated with providers, not the amount a patient is billed. What you owe depends on your plan's deductible and coinsurance. Based on rates published by 5 insurance carriers under federal price transparency rules.

Where it's billed changes the price

Billed byTypicalRange
Physician practiceA doctor's office, clinic or independent provider$11.48$11.48 to $11.48
FacilityA hospital or hospital-owned outpatient department$89.13$27.54 to $107

How much rates vary

Facilitymedian $89 · 10th to 90th $11 to $174Professionalmedian $11 · 10th to 90th $11 to $54
$10$20$50$100facility $89professional $11

Distribution of negotiated rates across all payers (price axis is log-scale). Each curve is scaled to its own total: facility and professional rates are different services, shown together to compare where they cluster. Need provider-level prices or 24+ months of history? Contact us.

Rates by insurance carrier

Insurance Carrier
Aetna
Setting
Facility
Modifier
Global
Typical Low
$11.48
Median
$89.13
Typical High
$181.97
Aetna
Setting
Professional
Modifier
Global
Typical Low
$11.48
Median
$11.48
Typical High
$11.48
CareFirst
Setting
Professional
Modifier
Global
Typical Low
$43.65
Median
$77.62
Typical High
$169.82
Cigna
Setting
Facility
Modifier
Global
Typical Low
$25.12
Median
$25.70
Typical High
$58.88
Cigna
Setting
Professional
Modifier
Global
Typical Low
$8.32
Median
$17.38
Typical High
$117.49
Kaiser Permanente
Setting
Professional
Modifier
Global
Typical Low
$29.51
Median
$29.51
Typical High
$30.90
United
Setting
Facility
Modifier
Global
Typical Low
$8.91
Median
$18.20
Typical High
$52.48
United
Setting
Professional
Modifier
Global
Typical Low
$6.46
Median
$9.77
Typical High
$26.30

Where Washington, DC sits

The same service costs 3.6 times more in West Virginia than in Kentucky. Every bar is a state, most expensive first. Touch or drag across it to read any state, then open that state for its carriers and full range.

Washington, DC· 9th of 51

$27.54

WV $50.12KY $13.80

Median negotiated rate in each state, from every insurer that publishes one. States where no insurer publishes a rate for this service are not shown.