Here is your old thread:
http://www.yorkietalk.com/forums/sic...tic-shunt.html
With bile acids over 500 and U/S only being 60-80% accurate, more testing should probably be done. Did the vet say anything about a Protein C Test? Any liver functioning issue can cause high bile acids but since LS is so common in Yorkies, that is usually the culprit. What were her symptoms again?