Fibrinogen · high result
What does a high Fibrinogen mean?
Short answer
Fibrinogen is both a clotting factor and an acute-phase protein, so a high level most often reflects inflammation, infection, recent surgery or injury, pregnancy, smoking, obesity or oral estrogens. Persistently high fibrinogen is associated with higher cardiovascular risk, which is why it appears on heart-health panels — though it is a risk marker, not a target to treat directly.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for Fibrinogen?
- age 18+: 200 – 400 mg/dL
Often reflects inflammation, infection, or pregnancy.
Full reference table, citations and testing options: Fibrinogen biomarker page.
What are the common causes of high Fibrinogen?
- Acute or chronic inflammation, infection
- Pregnancy, oral contraceptives or estrogen therapy
- Smoking, obesity, sedentary lifestyle, older age
- Recent surgery, trauma, heart attack, stroke
- Cancer, nephrotic syndrome, diabetes
What symptoms go with high Fibrinogen?
- None from fibrinogen itself
What do clinicians usually check next?
- hs-CRP to confirm inflammation; repeat when well
- Cardiovascular risk review — lipids, ApoB, blood pressure, A1c
- Lifestyle factors (smoking cessation, activity, weight) are what lower it
Follow-up tests available at TestWell: Heart & Body Inflammation Test (hs-CRP) ($34.99), C-Reactive Protein (CRP) ($26.99).
How do you recheck Fibrinogen?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Blood Clotting Panel | Panel · 4 tests | $149.99 | No | 3–7 business days |
| Inflammation Panel | Panel · 7 tests | $119.99 | Yes | 2–5 business days |
| Total Body Panel | Panel · 49 tests | $499.99 | Yes | 5–10 business days |
| Fibrinogen Activity | Test | $22.99 | No | 2–4 business days |
Common questions
Does high fibrinogen mean I'm at risk of a clot?
Modestly — it is one of several markers associated with cardiovascular and clot risk, alongside smoking, lipids, blood pressure and glucose. It is not a reason for blood thinners by itself.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.