LDL cholesterol of 3.15 mmol/L is normal. LDL cholesterol is a type of lipoprotein with high cholesterol content in plasma. Under normal circumstances, LDL cholesterol should be lower than 3.4mmol/L, and 3.15mmol/L is within the normal range. Conditions such as a high fat diet, obesity and coronary heart disease can raise LDL cholesterol, so maintaining good lifestyle habits can help to keep LDL cholesterol values within the normal range. It should be noted that LDL cholesterol alone is not enough to make a complete judgment on the health status of blood lipids, and it is generally necessary to combine the results of total cholesterol, triglycerides, HDL cholesterol and other tests to make a more comprehensive judgment on the patient’s blood lipid profile. Patients with dyslipidemia should consult a doctor in a timely manner and follow the doctor’s instructions for further treatment.