Thromboses and disorders of hemostasis in nephrotic syndrome. Thromboembolic complications are common in nephrotic syndrome (NS). This article reviews the factors of thrombogenesis in NS, including: 1) a hypercoagulable state with platelet hyperaggregability, hyperfibrinogenemia and elevated factor VIII, decrease in plasma levels of coagulation inhibitors antithrombin III and free protein S, reduced fibrinolytic activity; 2) excessive intravascular thrombin formation marked by increased plasma levels of fibrinopeptide A. The intensity of hemostasis disorders coincides with that of NS. Most disorders are related to hypoalbuminemia and proteinuria. In agreement with experimental data, the role of intraglomerular activation of coagulation during active phases of glomerulopathies has to be considered. This could explain the predominance of renal vein thrombosis in several glomerulopathies with NS. Several coagulation disorders in SN have implications for therapy.