Lipoprotein a is a test used to determine the extent of atherosclerosis. Lipoprotein a is mainly synthesized in the liver and its main physiological role is to prevent the dissolution of blood clots in blood vessels and to promote the formation of atherosclerotic plaques. Therefore, a constant elevation of lipoprotein a can be used to detect myocardial infarction, angina pectoris, and cerebral hemorrhage. The normal value of lipoprotein a is <300 mg/L. Increased lipoprotein a is common in atherosclerosis, acute coronary syndrome, congenital elevation of blood cholesterol, diabetes mellitus, etc. Decreased lipoprotein a is common in liver disease, congenital deficiency of lipoprotein a, and after taking medication. Elevated lipoprotein a can take related drugs, such as vitamin B3, etc., to reduce lipoprotein a to normal levels, the specific use of drugs, follow the doctor's instructions.