blood aspartate transaminase amount AST level Trait.ontology EFO:0004736 aspartate transaminase level The proportion, quantity, or volume in whole blood, serum, or plasma of this enzyme, which catalyzes the reversible transfer of an amine group from l-glutamic acid to oxaloacetic acid, forming alpha-ketoglutaric acid and l-aspartic acid; aids in diagnosis of viral hepatitis and myocardial infarction. CMO:0000043 CMO:0000581 CMO:0000580 VT:0000203 aspartate aminotransferase level blood enzyme amount