plasma aspartate aminotransferase activity level CMO:0000043 The amount of enzymatic activity of glutamic-oxaloacetic transaminase enzyme, commonly known as aspartate transaminase or aspartate aminotransferase (AST), in a specified sample of plasma. AST catalyzes the reversible transfer of an amine group from l-glutamic acid to oxaloacetic acid, forming alpha-ketoglutaric acid and l-aspartic acid. Plasma AST level is used as an enzymatic marker for liver disease or damage. VT:0000203 clinical_measurement_ontology plasma AST activity level plasma GOT activity level plasma aspartate transaminase activity level plasma glutamic-oxaloacetic transaminase activity level blood aspartate aminotransferase activity level