[107barney]

Usually liver shunts (large shunts) are suspected when the post number is over 100. Your vet could also be looking for microscopic shunting -- called microvascular dysplasica (or MVD). That is what my dog has and this is a common condition in yorkies. However, not all bile acids elevations mean that your dog has liver shunt or MVD.

An ultrasound may help with figuring some of this out but ultrasounds do not always find shunts. I did an ultrasound in my dog because it was the least invasive test and we learned other information from this test.

This is what the lab Antech has to say about bile acids results --

FASTING BILE ACID CONCENTRATIONS
Elevated fasting bile acid concentrations can occur with inadequate fasting, spontaneous gall bladder contraction and with
hepatobiliary disease. The probability of hepatobiliary disease increases when fasting bile acids exceed 25 umol/ L.
Fasting bile acids may be higher than those of postprandial samples. Potential causes include gall bladder contraction and
delayed gastric emptying. If either result exceeds 25 umol/L, abnormal liver function should be considered.

POSTPRANDIAL BILE ACID CONCENTRATIONS
Elevated postprandial bile acids are supportive of hepatobiliary disease. The majority of animals with congenital or acquired
portosystemic shunting have markedly increased postprandial values (>100 umol/L).