Because there are various liver function tests available, there are different normal levels for each specific test. For example, some liver tests can include ALT, ALP, AST, albumin and total protein. For adult men, the normal level for ALT is given as being between 7 and 55 units per liter, AST normal levels range between 8 and 48 units per liter and albumin normal levels are between 3.5 to 5.0 grams per deciliter, relates the Mayo Clinic.
High levels of aspartate aminotransferase, or AST, and alanine aminotransferase, or ALT, which are liver enzymes, can indicate some type of liver disease, suggests MedicineNet. High levels of both ALT and AST can be related to liver damage, reports WebMD.
Some other liver test are for measuring the amount of enzymes like alkaline phosphatase, or ALP, and gamma-glutamyl transpeptidase, GGT. In adult men, the normal level for ALP is between 45 to 115 units per liter, while the range for GGT is from 9 to 48 units per liter.