The normal reference range (ideal range) for low-density lipoprotein cholesterol (LDL-C) is less than 2.6 mmol/L, which may vary from hospital to hospital, from measurement method to measurement method, and from instrument to instrument. LDL is the main cholesterol-transporting lipoprotein in plasma, and its main function is to transport cholesterol to extrahepatic tissues. LDL-C is the main factor causing atherosclerosis, and when high, it can be deposited into the blood vessel wall to cause atherosclerosis, which in turn can cause blood vessel stenosis or occlusion. The ideal range of blood LDL-C is <2.6mmol/L, borderline elevation is 3.4-4.0mmol/L, and elevation is ≥4.1mmol/L. The reference range of different hospitals, measurement methods and instruments may vary, so please refer to your local hospital. Please consult your doctor for specific information.