<qa>  What isoenzyme must be less than or equal to 3 times ULN?- Alkaline phosphatase ALP, alanine aminotransferase ALT, and aspartate aminotransferase AST less than or equal to 3 times ULN. For total ALP greater than 3 times ULN, the ALP liver isoenzyme must be less than or equal to 3 times ULN. 