There was a thread where this test was mentioned but thought it better to post what I found out in a new post under this forum.
Urine Bile Acid tests can be done, it seems, to test for liver shunts as an intial test.
I googled urine bile acid tests and found these sites for info including Dr. Jean Dodds clinic that can analyze the samples.
http://avmajournals.avma.org/doi/abs...rnalCode=javma
Dr Jean dodds
http://www.canine-epilepsy-guardian-...structions.htm
Another article
http://www.dvmnewsmagazine.com/dvm/a....jsp?id=134764