A polydeoxyribonucleotide with antithrombotic, thrombolytic, and fibrinolytic properties. Defibrotide sodium induces the release of prostaglandin 12 and reduces the expression of adhesion molecules on endothelial cells, thereby interfering with platelet and leukocyte adhesion to the endothelium. OR A final diagnosis that is made after getting the results of tests, such as blood tests and biopsies, that are done to find out if a certain disease or condition is present.