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Fibrinogen (Serum) – Quantitative

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

This test measures the amount of fibrinogen in your blood, a protein that plays a key role in blood clotting. Fibrinogen helps your body form clots to stop bleeding when you’re injured.

Quick summary

["Fibrinogen helps control bleeding and supports blood clot formation—critical for normal health."]

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

Key facts at a glance

LOINC
33080-3
Short code
GA from BPD.Lessoway98
Synonyms
GA from BPD.Lessoway98
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-bpd-lessoway
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 recommend this test if you have symptoms like excessive bleeding, easy bruising, or a history of clotting problems. It may also be checked before surgeries, during pregnancy, or if you have conditions like liver disease, which can affect fibrinogen levels.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. It usually takes a few minutes, and you may feel a brief pinch. Avoid eating or drinking for 8–12 hours before the test if instructed by your doctor.

What Happens During the Test

A healthcare professional will clean your arm with an antiseptic, insert a needle into a vein, and collect blood into a tube. The blood is then sent to a lab for analysis. The process is quick and typically painless.

What the Results Mean

Results are compared to a general reference range, but your doctor will interpret them in the context of your health history and symptoms. Low levels may indicate bleeding disorders or liver issues, while very high levels could suggest inflammation or pregnancy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fibrinogen Level

Frequently asked questions

What could my results indicate?
Low fibrinogen levels may signal conditions like liver disease, severe infections, or certain blood disorders. High levels might be linked to pregnancy, inflammation, or dehydration. Your doctor will discuss these findings with you based on your medical history and symptoms.
How often should I get this test?
This test is often done once or occasionally, depending on your health needs. Your doctor will determine how frequently you need it based on your treatment plan or ongoing conditions.
Can I eat or drink before this test?
Typically, you should avoid food for 8–12 hours before the test, but follow your doctor’s specific instructions. Some tests may allow water or clear liquids, so confirm with your healthcare provider.
  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