What Is the Normal Range for Liver Function?

Normal liver enzyme ranges for aspartate aminotransferase, or AST, are between 10 and 40 units per liter, while normal ranges for alanine aminotransferase, or ALT, are between 7 and 56 units per liter, according to eMedicineHealth. AST and ALT are enzymes used to detect injury or damage to the liver.