If the blood panel shows a reason to do further testing on the liver - There is a new bile acid test done on the urine which requires no fasting and only one test. Here's a link to read about it, your vet may or may not be familiar with the test.
http://www.canine-epilepsy-guardian-...id_testing.htm
I was looking at the above normal values in blood tests - the first is for dogs, the second set is for cats.