Low plasminogen activity may be caused by hematologic disorders, liver function abnormalities, and so on. 1. Blood system diseases: the normal value of prothrombinogen activity is between 12 and 14 seconds, and the activity is between 75% and 100% according to the percentage. When the patient’s blood is seriously contaminated or suffers from diseases such as leukemia, the blood circulatory system will be abnormal. In such cases, the prothrombinogen activity will also be lower. If left untreated, the plasminogen activity will continue to fall. 2. Abnormal liver function: The liver is an important organ for blood production and blood circulation. If the liver is abnormal, it will usually have adverse effects on the blood system, resulting in decreased plasminogen activity. It is recommended to consult a doctor in time for relevant examinations and, according to the specific situation, carry out symptomatic treatment under the doctor’s guidance.