Coagulation
Fibrinogen
LOINC 3255-7 · mg/dL
Ranges
Reference range: 200–400 mg/dL
What it is
Fibrinogen is a protein made by the liver that is essential for blood to clot. It is also an inflammation-responsive protein.
Why it matters
It helps assess clotting ability and bleeding risk, and can reflect inflammation.
What high values can mean
A higher value can reflect inflammation and is associated with a greater tendency to clot.
What low values can mean
A lower value can impair clotting and raise bleeding risk, from liver issues or being used up in clotting.
How to improve it
Fibrinogen follows liver health and inflammation; care targets the underlying cause.
Food & lifestyle
Not smoking and an anti-inflammatory lifestyle support healthier fibrinogen; the cause matters more than diet alone.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
An abnormal fibrinogen is interpreted by a doctor with your clotting tests and clinical picture.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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