AST (aspartate aminotransferase) and ALT (alanine aminotransferase) are two enzymes that are typically elevated in people with alcoholic liver disease. AST is an enzyme found in liver cells, and it is released into the bloodstream when the cells are damaged. ALT is an enzyme found in the liver and other organs, and it is released when the liver is damaged. Elevated levels of these two enzymes can indicate liver injury, and they are usually monitored as part of a routine liver function test. The normal range for AST is typically 0-40 U/L, and the normal range for ALT is typically 0-45 U/L. However, in people with alcoholic liver disease, these levels can be significantly elevated.