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Fibrinogen (Serum or Plasma Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of fibrinogen, a protein in your blood that helps blood clot. Low levels may increase bleeding risk, while high levels could signal inflammation or other conditions.

Quick summary

["Fibrinogen helps control bleeding and supports blood clot formation—levels can signal bleeding disorders or clotting issues."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
103226-7
Short code
FSP PPP LA-mCnc
Synonyms
FSP PPP LA-mCnc
Category
coagulation
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
la
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why It’s Done

Your doctor may order this test if you have symptoms like easy bruising, excessive bleeding, or signs of clotting problems. It’s also used to monitor conditions like liver disease, infections, or inflammatory disorders that affect fibrinogen production.

What to Expect

A small blood sample is drawn from a vein, usually in your arm. The blood is sent to a lab where it’s analyzed for fibrinogen levels. Results are typically ready within 24–48 hours.

Normal vs. Abnormal Results

Results are compared to standard ranges, but exact values can vary by lab. Low fibrinogen may indicate liver disease, blood disorders, or severe infections, while very high levels could suggest inflammation or pregnancy.

Common Conditions Affecting Results

Conditions like liver disease (which reduces fibrinogen), DIC (disseminated intravascular coagulation), or certain infections may lower fibrinogen. Rarely, high levels can occur with pregnancy, severe infections, or inflammatory diseases like rheumatoid arthritis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Fibrinogen Level

Frequently asked questions

How long does it take to get my fibrinogen test results?
Results are usually available within 24–48 hours, but timing depends on your lab’s processing speed. Your doctor will contact you once they’re ready.
What does a low fibrinogen level mean?
A low level may signal conditions like liver disease, blood clotting disorders, or severe infections. Your doctor will discuss symptoms and other tests to determine the cause.
Can diet or supplements affect fibrinogen levels?
Dietary factors like vitamin K (found in leafy greens) or certain supplements may influence clotting factors, but fibrinogen itself isn’t directly affected by diet. Your doctor will consider lifestyle factors if needed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy