LDLC stands for low-density lipoprotein cholesterol, and the normal range should be less than 3.1 mmol/L. However, although the normal range is less than 3.1 mmol/L, for patients with high risk factors for coronary heart disease and hypertension, especially those who have had a myocardial infarction, it is recommended that LDLC should be controlled at the lower end of the normal range, or even lower than the lower end. The benefit to the patient is greater, and it is generally recommended that it should ideally be controlled at around 1.8 mmol/L. The higher the LDL cholesterol, the higher the probability that the patient will suffer from angina pectoris, which is a high risk factor for atherosclerotic disease, so in cardiovascular departments, doctors pay particular attention to this lipid index.