Over-the-Counter Market. 1  Describing a security or trade that does not occur on an exchange. Very often, the OTC market includes securities that are very small and do not trade on an exchange because they do not meet market capitalization requirements. 2  A widespread aggregation of dealers who make markets in many different securities.
Liver tests check the blood for two main liver enzymes: 1  Aspartate aminotransferase (AST), formerly called SGOT; the AST enzyme is also found in muscles and many other tissues besides the liver. 2  Alanine aminotransferase (ALT), formerly called SGPT; ALT is almost exclusively found in the liver.
Liver enzymes are enzymes - - chemical substances that act as catalysts to strengthen chemical reactions - - that are produced by the liver. Each liver enzyme has a particular function in terms of maintaining the body's health, helping to metabolize various foods (especially fats), and other things that the liver does.hese enzymes are important for healthy bodily functioning, and the liver produces a great many of them which is a large part of why it is such an important and vital organ. Liver enzymes are found in the blood normally, but only in a certain range of concentration.