LDL is not normal if it is 19mmol/L. The LDL reference range is 2.07 to 3.62 mmol/L. LDL is an important component of lipids in human blood and is the major lipoprotein in fasting plasma, which can play a role in transporting cholesterol to extrahepatic tissues, with a normal reference range of 2.07~3.62mmol/L. Therefore, an LDL of 19mmol/L is not normal. Elevated LDL values are mostly seen in familial cholesterolemia, mixed hyperlipidemia, hypothyroidism, diabetes mellitus, nephrotic syndrome, chronic renal failure, as well as due to pregnancy, multiple leiomyosarcomas, medications, and other causes. It is generally believed that LDL greater than 5mmol / l above consider belonging to the possibility of familial hypercholesterolemia, 19mmol / L low belongs to the very severe elevation, clinical rare. LDL abnormalities, need to go to the hospital in time for examination, clear cause of treatment as prescribed by the doctor.