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Fibrinogen Degradation Products (FDP) Index

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

This test measures the presence of fibrin degradation products, which are fragments formed when blood clots break down. It helps assess whether you’re at risk for excessive bleeding or clotting.

Quick summary

["Fibrin degradation products indicate clot breakdown and can signal bleeding or clotting disorders."]

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

Key facts at a glance

LOINC
42169-3
Short code
FFDM Brst-L Dx
Synonyms
FFDM Brst-L Dx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mg-ffd
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

What This Test Measures

Fibrinogen is a protein in your blood that helps form clots. When clots dissolve naturally, they release small fragments called fibrin degradation products (FDPs). This test detects the level of these fragments in your blood, which can be elevated if clotting or bleeding occurs.

Why It’s Done

Your doctor may order this test if you have symptoms like excessive bleeding (e.g., easy bruising, nosebleeds, or heavy menstrual periods), unexplained clots, or if you’re undergoing surgery or a procedure that could affect clotting.

Common Conditions Monitored

High levels of FDPs may suggest recent clot formation or breakdown, which can be seen in conditions like disseminated intravascular coagulation (DIC), certain infections, or trauma. Low levels might indicate normal clot turnover or less active clotting activity.

Sample Collection and Preparation

This test uses a blood sample drawn from a vein. The blood is processed to separate plasma, where FDPs are measured. The test may be done on fresh plasma or stored samples, depending on lab protocols.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated FDPs can signal active clot breakdown, which may be linked to bleeding disorders, infections, or severe medical conditions like DIC. Doctors use this test to guide treatment, such as blood transfusions or anticoagulant medications, to manage bleeding risks or prevent clots.

Short name

FDP Level

Frequently asked questions

What does an abnormal result mean?
An elevated FDP result may indicate recent clot formation or breakdown, which could be due to bleeding disorders, infections, or trauma. A low result is less concerning but may need further evaluation if you have symptoms of clotting or bleeding.
How often should I get this test?
Your doctor will determine how often to repeat this test based on your symptoms, medical history, and treatment plan. Follow-up may be needed if you’re taking medications that affect clotting, such as anticoagulants.
Can lifestyle changes affect this test?
While diet and exercise generally don’t directly influence FDP levels, they may indirectly affect clotting risks. Avoiding medications that thin your blood (e.g., certain supplements) before testing can help ensure accurate results.
  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