Fibrinogen (Serum or Plasma)
This test measures the amount of fibrinogen, a protein in your blood that helps form clots when you bleed.
["Fibrinogen helps control bleeding and supports blood clotting—low levels may increase bleeding risk; high levels may raise clot risk."]
Key facts at a glance
- LOINC
- 60278-9
- Short code
- Fibrinogen Ag Tiss Ql IF
- Synonyms
- Fibrinogen Ag Tiss Ql IF
- Category
- coagulation
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 200
- Ref high
- 400
- Critical range
- 60 N/A – —
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- if
- CPT
- 85384
- SNOMED
- 47279000
- 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 Is This Test Done?
Your doctor may order this test to check for bleeding disorders, monitor blood clotting problems, or evaluate conditions like liver disease, kidney disease, or infections that can affect fibrinogen levels.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm to draw blood, or a sample may be collected from a vein. If you’re on blood thinners, discuss this with your provider first.
What the Results Mean
Results are compared to a general reference range, but your actual values may vary based on health, age, and other factors. Abnormal levels could signal conditions like clotting disorders, liver disease, or infections.
Common Conditions Linked to Fibrinogen
Low fibrinogen may be linked to conditions like liver disease (where the body can’t produce enough), severe infections, or certain blood disorders. High levels could be seen in chronic inflammation, pregnancy, or some clotting disorders.
Reference range
Adult: 200-400 mg/dLN/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Fibrinogen plays a key role in blood clotting and wound healing. Low levels may increase bleeding risk, while high levels could raise the chance of clots forming in veins or arteries. Regular monitoring may be needed if you have conditions like liver disease or clotting disorders.
Short name
Fibrinogen
Frequently asked questions
What causes low fibrinogen levels?
What causes high fibrinogen levels?
Can diet affect fibrinogen levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy