For a healthy population, a low-density lipoprotein cholesterol (LDL-C) of 2.8 mmol/L is within the normal range. In patients with comorbidities, LDL-C needs to be controlled at a much lower level. The normal range for LDL-C in healthy people is <3.4mmol/L. Anything above this range is cause for alarm. LDL-C between 3.4 and 4.1mmol/L is considered borderline elevated, and ≥4.1mmol/L is considered significantly elevated. For patients with coronary heart disease, stroke, peripheral atherosclerosis and other diseases, the LDL-C level needs to be controlled below 1.8 mmol/L. For patients with diabetes mellitus, hypertension, hypercholesterolemia and other diseases, the LDL-C level needs to be <2.6mmol/L. If there are patients with dyslipidemia, it is recommended to go to a regular hospital to test the blood lipids, and be guided by a doctor to regulate lipid regulation in order to reduce the risk of disease.