LDL cholesterol or Lipoproteins are combinations of lipids or fats and proteins. LDL cholesterol is a white crystalline substance, which is commonly found in animal tissues and multiple foods. It is manufactured by the liver and is an integral component of cell membranes.

The cholesterol, which cannot be dissolved in the blood, is transported by the low-density lipoproteins across the cells. The abnormal LDL cholesterol level present in the blood can lead to the development of several other disorders, such as the growth of atherosclerotic plaque and coronary artery disease. Therefore, the LDL cholesterol is also called as bad cholesterol. If excessive LDL is present in the blood, it starts building up in the internal walls of the arteries that go to the heart and brain. The LDL cholesterol along with other substances can create plaque, which gets deposited in the narrow arteries. Therefore, arteries become less supple. This condition is termed as atherosclerosis, and can prove fatal if a clot forms there. A clot can block a narrowed artery, and eventually leads to a heart attack.

On the other hand, the high-density lipoprotein, or HDL, is termed as good cholesterol. The total cholesterol count is determined through a blood test. This blood test requires determining LDL levels as a part of lipid profile. The lipid profile also includes testing for total cholesterol, HDL, and triglycerides. The lipid profile may be recommended as a routine test for a healthy person. It helps determining if the total cholesterol is high because of excessive LDL.

The LDL test is used to anticipate the possibility of developing a heart disease. The LDL cholesterol is the most crucial form of cholesterol, which helps in determining the risk of heart disease. Moreover, the heart treatment also depends on the LDL values.