On your lab requisition: Quest “Fibrinogen Activity, Clauss” (test code 461)
The short answer
Measures fibrinogen, a clotting protein and independent cardiovascular risk factor linked to inflammation, measured from a standard blood draw. At TestWell it costs $22.99 plus a $6 lab processing fee, needs no fasting, and results post in 2–4 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$125
cash pay
Other Labs
$30
+ lab fees
TestWell
$22.99
+ $6 lab processing fee
Fibrinogen is a protein produced by the liver that plays a central role in blood clot formation. Beyond clotting, elevated fibrinogen is an independent risk factor for heart attack and stroke — it reflects both inflammation and a hypercoagulable state. It rises during acute illness, chronic inflammation, smoking, and obesity. Monitoring fibrinogen alongside hs-CRP provides a more complete picture of cardiovascular inflammation.
Cardiovascular biomarkers identify hidden risk for heart attack and stroke years before symptoms appear, allowing for earlier intervention with diet, exercise, or medication.
Adults 35+ for routine cardio screening, anyone with family history of premature heart disease, and patients tracking response to statins, lifestyle changes, or other cardiovascular therapy.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed At
Quest or Labcorp
Your Fibrinogen Activity results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
No fasting required.
A Fibrinogen Activity test costs $22.99 at TestWell — $28.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $125.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest or Labcorp) | $22.99 | $28.99 | Includes the one $6 lab processing fee, charged once per order |
| TestWell (drawn at BioReference — New York & New Jersey) | $30.99 | $36.99 | New York and New Jersey orders route to BioReference; Quest Health and Labcorp OnDemand don't take self-ordered draws in those states |
| Hospital outpatient lab, self-pay (typical) | $125.00 | $125.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 461 · Labcorp test no. 001610 · BioReference code 0089-3. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Most Fibrinogen Activity results are available in 2–4 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal.
Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available.
On TestWell, the Fibrinogen Activity is $22.99. Quest Direct lists comparable tests at $30. Walk-in hospital labs typically bill $125 or more without insurance. Insurance is not required — pay one all-in price.
The Fibrinogen Activity is available at Quest and Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you.
No, fasting is not required for a Fibrinogen Activity test — you can eat normally and book any time of day.
The CPT code for a Fibrinogen Activity test is 85384. You can order it from TestWell for $22.99 — no doctor's visit or insurance required, with results in 2–4 business days.
The Fibrinogen Activity test is Quest Diagnostics test code 461 ("Fibrinogen Activity, Clauss"), Labcorp test number 001610, BioReference code 0089-3 (CPT 85384). TestWell orders it under those codes for $22.99 at Quest, Labcorp or BioReference — no doctor's visit or insurance required, results in 2–4 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$22.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Blood Clotting Panel
Save $50.97This test is part of the Blood Clotting Panel — 4 tests · 18 biomarkers for $149.99, $50.97 less than à la carte.
$149.99$200.96
4 tests · 18 biomarkers
Frequently ordered together
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Fibrinogen Activity
$22.99