Low Density Lipoprotein is abbreviated as LDL. It is low density lipoprotein. The normal level of cholesterol in the blood is 0.15-1.20%. High levels of LDL in the blood are harmful (<100 mg/dl). LDL carries about 1500 cholesterol esters per molecule. If the level of cholesterol in the blood is high, it accumulates in the lining of the blood vessels and narrows the blood flow. It increases blood pressure in the body and reduces blood flow. As a result, blood flow to the heart decreases and heart disease occurs. If its level is high, the person becomes unconscious. Chest pain. A heart attack may occur. Heart failure occurs. Coronary thrombosis may occur. Generally men have higher LDL and women have lower. LDL is called bad cholesterol.