It is a natural fatty substance that is in all the cells of the human body. It occurs in the liver, but also through the digestion of some foods.
Low-density cholesterol (LDL) is responsible for transporting new cholesterol from the liver to all the cells in our body.
High-density cholesterol (HDL) collects unused cholesterol and returns it to the liver for storage or excretion to the outside through bile.
It is measured by pricking peripheral blood on a finger.