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Fibrinogen (Quantitative) in Serum

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

This test measures the amount of fibrinogen, a protein in your blood that plays a key role in blood clotting.

Quick summary

["Fibrinogen helps prevent excessive bleeding by forming clots when needed."]

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

Key facts at a glance

LOINC
11933-9
Short code
GA from HC.Hoffbauer79
Synonyms
GA from HC.Hoffbauer79
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-hc-hoffbauer
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 easy bruising, prolonged bleeding, or if they suspect a blood clotting disorder. It can also be part of routine blood work or to monitor conditions like liver disease or kidney problems that affect protein production.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood-thinning medication, let your doctor know before the test.

How the Test Works

Blood is drawn from a vein, typically in your arm. The sample is sent to a lab where it is analyzed to measure the concentration of fibrinogen, a protein involved in blood clotting.

What the Results Mean

Results are reported in grams per liter (g/L). Lower than expected levels may indicate conditions like liver disease or vitamin K deficiency, while higher levels could be seen in pregnancy or certain inflammatory conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Fibrinogen levels can help diagnose or monitor bleeding disorders, clotting disorders, or liver/kidney conditions. Abnormal results may prompt further testing or adjustments to treatment plans, such as medications or dietary changes.

Short name

Fibrinogen Level

Frequently asked questions

What causes low fibrinogen levels?
Low fibrinogen can be caused by liver disease, severe infections, blood loss, or certain medications. It may also occur in people with conditions like DIC (disseminated intravascular coagulation).
What causes high fibrinogen levels?
High fibrinogen levels are sometimes seen in pregnancy, infections, or inflammatory conditions like rheumatoid arthritis. Rarely, it can be genetic or linked to certain cancers.
How often should I get this test?
Your doctor will determine the frequency based on your health needs. Routine tests may not be needed unless you have symptoms or a condition that affects fibrinogen levels.
  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