Used as an anticoagulant to prevent blood clotting during medical procedures such as dialysis, heart surgery, and blood transfusions. Commonly administered intravenously or subcutaneously to treat and prevent deep vein thrombosis (DVT) and pulmonary embolism. Also used to flush intravenous catheters to keep them clear of clots. Widely applied in clinical settings where rapid and reversible anticoagulation is required.