Human Phenotype Ontology term HP_0031956 (Elevated circulating aspartate aminotransferase concentration) is the concentration of aspartate aminotransferase (AST) in the blood circulation is above the upper limit of normal. Also known as: Aspartate aminotransferase increased, Elevated serum AST, Elevated serum aspartate aminotransferase, Elevated serum glutamic oxaloacetic transaminase.