Lipids is the abbreviation for the lipids in the blood. It includes cholesterol, triglycerides and phospholipids. Basic lipid screening generally includes the following: TC: abbreviation for total cholesterol, which represents all cholesterol in the blood, and is now considered one of the most effective measures for the prevention and treatment of coronary heart disease. TG: Abbreviation for triglycerides, representing all triglyceride levels in the blood. Simple hypertriglyceridemia is not an independent risk factor for coronary heart disease, but only when it is accompanied by hypercholesterolemia or low HDL cholesterol, etc. LDL-C: The abbreviation for low-density lipoprotein cholesterol, which is a complex of multiple components containing high levels of cholesterol, and is therefore the most important lipid indicator at present. HDL-C: Abbreviation for high-density lipoprotein cholesterol, which reflects the concentration of high-density lipoprotein in the blood. HDL is a specific indicator that is elevated, which is a good thing, and low, which increases the risk of cardiovascular disease. The role of cholesterol in the human body Cholesterol is widely present in all tissues of the human body and plays an important physiological role, being an indispensable substance for the human body. A cholesterol level of 50-70 mg/dl (1.3-1.8 mmol/L) in human blood can maintain normal physiological functions, while a high cholesterol level can lead to atherosclerosis.