This node is related to the Total Cholesterol level in plasma, as a blood marker. Other types of cholesterol are sub types of this one.
«Cholesterol (from the Ancient Greekchole- (bile) and stereos (solid), followed by the chemicalsuffix-ol for an alcohol) is an organicmolecule. It is a sterol (or modifiedsteroid), a type of lipid molecule, and is biosynthesized by all animal cell, because it is an essential structural component of all animalcell membranes.
In addition to its importance for animal cell structure, cholesterol also serves as a precursor for the biosynthesis of steroid hormone, bile acid and vitamin D. Cholesterol is the principal sterol synthesized by all animals. In vertebrates, hepatic cell typically produce the greatest amounts. It is absent among prokaryotes (bacteria and archaea), although there are some exceptions, such as Mycoplasma, which require cholesterol for growth.
François Poulletier de la Salle first identified cholesterol in solid form in gallstone in 1769. However, it was not until 1815 that chemist Michel Eugène Chevreul named the compound "cholesterine".» (wikipedia)