This is a method which quantifies the enzymatic activity of glutamic-oxaloacetic transaminase enzyme, commonly known as aspartate transaminase or aspartate aminotransferase (AST), in a specified sample of blood. AST catalyzes the reversible transfer of an amine group from l-glutamic acid to oxaloacetic acid, forming alpha-ketoglutaric acid and l-aspartic acid. Blood AST level is used as an enzymatic marker for liver disease or damage.