What Is a Normal Level for Liver Enzymes?

The normal levels for the most common liver enzymes, aspartate aminotransferase and alanine aminotransferase, are 10 to 40 units per liter and 7 to 56 units per liter, says eMedicineHealth. Mild elevations two to three times the size of those figures do occur, and severe levels typically reach over 1000.