D-dimer (or D dimer) is a fibrin degradation product (or FDP), a small protein fragment present in the blood after a blood clot is degraded by fibrinolysis. It is so named because it contains two crosslinked D fragments of the fibrin protein.
D-dimer concentration may be determined by a blood test to help diagnose thrombosis. Since its introduction in the 1990s, it has become an important test performed in patients with suspected thrombotic disorders. While a negative result practically rules out thrombosis, a positive result can indicate thrombosis but does not rule out other potential causes. Its main use, therefore, is to exclude thromboembolic disease where the probability is low. In addition, it is used in the diagnosis of the blood disorder disseminated intravascular coagulation.
The main function of D-Dimer is to exclude thromboembolic disease where the probability is low. Its testing is of clinical use when there is a suspicion of deep venous thrombosis or pulmonary embolism (PE). In patients suspected of disseminated intra-vascular coagulation (DIC), D-dimer protein may aid in the diagnosis.
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