LDL 3.31mmol/L is more serious if it is combined with risk factors such as hypertension, coronary heart disease and diabetes; if not, it is less serious. Since LDL is a risk factor for atherosclerosis, its increased level is closely related to the occurrence of coronary heart disease, cerebral infarction and other diseases. The normal appropriate level of LDL should be ≤3.4mmol/L. If it exceeds 4.1mmol/L, it is considered elevated, and between 3.4 and 4.1mmol/L is considered borderline. However, for people with multiple risk factors such as hypertension, diabetes, cerebral infarction, etc., the ideal LDL level varies according to the degree of risk assessed, and should be less than 1.8mmol/L in the very high-risk group, less than 2.6mmol/L in the high-risk group, and less than 3.4mmol/L in the intermediate-risk and low-risk groups. It is recommended to consult a doctor to standardize the diagnosis and treatment if necessary.