Lipids include not only cholesterol, but also triglycerides, phospholipids and free fatty acids, etc. Clinical tests for lipids include serum lipid profile, serum lipoprotein profile and serum apolipoprotein profile. Serum lipids include total serum cholesterol and triglycerides, serum lipoproteins include celiac disease, HDL cholesterol, LDL cholesterol, and lipoprotein (a), and ApoA, mainly ApoA1 and ApoB, the most important of which is LDL. Clinically, it is important for the diagnosis, treatment and prevention of atherosclerosis as well as cardiovascular and cerebrovascular diseases.