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Fibrinogen (Mass Concentration)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of fibrinogen in your blood, a protein crucial for blood clotting.

Quick summary

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

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
56784-2
Short code
Fibrinogen Frg Ur-mCnc
Synonyms
Fibrinogen Frg Ur-mCnc
Category
coagulation
Sample
urine
Container
Sterile urine container
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
CPT
85384
SNOMED
47279000
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to check for bleeding disorders, clotting problems, or conditions like liver disease, where fibrinogen production might be affected. It can also help diagnose or monitor certain cancers or infections that may alter blood protein levels.

What to Expect Before the Test

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

What the Results Mean

Lower than expected fibrinogen levels may suggest bleeding disorders, liver disease, or severe infections. Higher levels could indicate dehydration, inflammation, or certain cancers. Your doctor will interpret results in the context of your overall health.

Common Conditions Monitored

This test is often used to evaluate bleeding risks before surgeries, assess liver function, or monitor conditions like disseminated intravascular coagulation (DIC) or multiple myeloma.

Reference range

Adult: 200-400 mg/dLN/A

Specimen: urine

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.

Clinical Significance: Fibrinogen plays a key role in blood clotting and wound healing. Abnormal levels can indicate underlying health issues that may require treatment, such as managing bleeding disorders or preventing excessive clotting in patients at risk.

Short name

Fibrinogen Level

Frequently asked questions

What causes low fibrinogen levels?
Low fibrinogen can result from liver disease (where the body can’t produce enough), severe infections, blood loss, or certain medications. It may also appear in conditions like DIC or after trauma.
What causes high fibrinogen levels?
High fibrinogen is sometimes seen in dehydration, inflammation, or infections. Rarely, it may be linked to certain cancers or genetic disorders.
Can diet affect fibrinogen levels?
Dietary factors like high protein intake or certain foods (e.g., soy, fish) may influence fibrinogen indirectly, but this test primarily reflects your body’s natural production and clotting activity.
  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 17, 2026. · Read our editorial policy