PTA in medicine generally refers to percutaneous transluminal angioplasty; it can also refer to prothrombinogen activity, whose normal value range is 75%-100%. 1. Percutaneous Transluminal Angioplasty: In medicine, PTA at this time refers to atherosclerotic recanalization of the arteries after dilatation by means of catheters and other instruments, or it can be used to treat other causes of stenosis of blood vessels, occlusive lesions and other diseases. Common modalities include laser angioplasty, balloon angioplasty, vascular self-supporting devices, and atherosclerotic plaque excision. It is generally used to treat diseases such as coronary artery stenosis of the heart, peripheral limb arteries, renal arteries, and arteriovenous fistulae. 2. Plasminogen activity: In medicine, at this time, PTA refers to plasminogen activity, which is commonly used in liver coagulation function, liver reserve function and other tests, which can reflect the severity of liver disease. Clinically, patients with severe hepatitis, acute and chronic hepatitis, biliary obstruction and other liver diseases are prone to abnormal prothrombin activity. Clinically, it is also necessary to determine its specific significance according to the situation.