Transaminases are a common and important measure of liver function. The liver cells are the main site of aminotransferases. When hepatocytes are damaged by inflammation and necrosis, transaminases are released into the bloodstream, causing an increase in serum transaminases. The normal values for glutamic aminotransferase are 0-40 units per liter. The normal ratio of glutathione to glutathione is 1.5 to 2.5.