For future reference, dug around the internet yesterday and the general consensus was the following:
AST: 2-3x normal is concerning, but values can go as high as 1000iu in total failure
ALT: same as AST
Note that an elevation in just ALT and AST is not indicative of liver issues, all liver values should be taken together. So if, for example, bilirubin and albumin are in range, a slightly elevated AST/ALT isn't concerning.
Cholesterol values: If total cholesterol is high, and individual values are 2x normal, there's an increased risk of heart disease. Deviations in the 20-50% range and interesting but don't correspond to greatly increased risk.