red blood cells trapped by fibrin threads Fibrinogen is an insoluble protein made by the liver and floats around in the blood. It is converted to fibrin by thrombin, a clotting enzyme, at bleeding sites.
occurs when your blood doesn't have enough healthy red blood cells. Anemia is not treatable until the underlying cause has been established. The treatment for one type of anemia may be both inappropriate and dangerous for another type of anemia.