Fibrinogen (Serum) with Automated Clotting Assay
This test measures the amount of fibrinogen in your blood, a protein that helps blood clot. It’s often checked when you have bleeding problems, clotting issues, or certain medical conditions.
["Fibrinogen helps control bleeding and supports blood clotting—your levels can signal health risks or conditions like clotting disorders."]
Key facts at a glance
- LOINC
- 11940-4
- Short code
- GA from tib len
- Synonyms
- GA from tib len
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- us-estimated-from-tibia-length
- 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 This Test Might Be Ordered
Your doctor may order this test if you have symptoms like unusual bruising, excessive bleeding, or if they suspect a clotting disorder. It’s also used to monitor conditions like liver disease, kidney problems, or after surgery to track how well your blood is clotting.
What to Expect Before the Test
No special preparation is needed, but you may be asked to fast for a few hours before the blood draw if your doctor specifies it. The test involves a simple blood sample taken from a vein in your arm.
What the Results Mean
Lower than expected fibrinogen levels may indicate liver disease, bleeding disorders, or certain infections. Higher levels could suggest inflammation, pregnancy, or clotting disorders. Your doctor will discuss results in the context of your overall health.
Common Conditions Monitored
Fibrinogen is often checked in people with liver disease (since the liver produces it), those who have had recent surgery, or those with inherited bleeding or clotting disorders like von Willebrand disease.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Fibrinogen is a key protein in blood clotting. Low levels can signal liver dysfunction or bleeding risks, while high levels may point to inflammation or other underlying conditions. Your doctor may adjust treatments or monitor you closely if your results are outside expected ranges.
Short name
Fibrinogen
Frequently asked questions
What causes abnormal fibrinogen levels?
How long does it take to get results?
Can I eat or drink before this test?
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 16, 2026. · Read our editorial policy