Heparin lithium salt is widely used in medical and biochemical applications due to its anticoagulant properties. It is commonly employed in blood collection tubes to prevent clotting, ensuring that blood samples remain liquid for accurate analysis in clinical laboratories. This is particularly important for tests requiring plasma, such as electrolyte measurements or certain enzyme assays. Additionally, it is used in research settings to study blood coagulation mechanisms and to develop anticoagulant therapies. Its effectiveness in inhibiting thrombin and other clotting factors makes it a valuable tool in both diagnostics and experimental studies.