肝素钠可用于预防和治疗血栓栓塞性疾病，如：心肌梗塞、肺栓塞、脑血管栓塞、外周静脉血栓等，可防止血栓的形成和扩大。

Heparin sodium can be used for the prevention and treatment of thromboembolic diseases, such as myocardial infarction, pulmonary embolism, cerebrovascular embolism, and peripheral venous thrombosis. It can prevent the formation and enlargement of blood clots.