Definition of Fibrin degradation products:

Fibrin degradation products (FDPs) are the substances left behind when clots dissolve in the blood. This article discusses the blood test to measure these products.

How the test is performed:

A blood sample is needed. For information on how this is done, see: Venipuncture

The blood is sent to a laboratory. The laboratory specialist will run tests on the blood sample to measure the products that are left behind when blood clots dissolve.

How to prepare for the test:

Your health care provider may tell you to stop taking certain drugs before the test. Drugs that may increase FDPs include barbiturates, heparin, streptokinase, and urokinase.

Do not stop taking any medicine without first talking to your doctor.

How the test will feel:

When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the test is performed:

This test is done to see if your clot-dissolving (fibrinolytic) system is working properly. Your doctor may order this test if you have signs of disseminated intravascular coagulation (DIC) or another clot-dissolving disorder.