- FIBRINOGEN- BLOOD TEST RANGES 200 and 400 mg/dL (2.0 to 4.0 g/L)
(coagulation factor I) is a glycoprotein complex that is synthesized by the liver and circulates in the blood stream. During tissue and or vascular injury, it is converted enzymatically by thrombin to fibrin which creates a blood clot The primary function is to occlude blood vessels thus stopping bleeding. Fibrin also binds and reduces the activity of thrombin. This activity referred to as antithrombin I, which limits clot formation. Fibrin also mediates and is important in blood platelet, endothelial cell spreading, capillary tube formation, tissue fibroblast proliferation, and angiogenesis thereby promoting revascularization and wound healing. Thrombin is synthesized in the liver and secreted into the general circulation in an inactive zymogen form (prothrombin), a complex multidomain glycoprotein that is activated to yield thrombin at sites of vascular injury by limited proteolysis following upstream activation of the coagulation cascade.