DO NOT go in for exploratory surgery!!! You need to have scintigraphy done before doing that. Please join -
Liver_Shunt_And_MVD_Support : Liver Shunt & MVD/HMD Support
they will be able to help you find someone qualified in your area to do the test and help answer any questions you have concerning Liver Shunt. My 3 lb baby had to have surgery in March and without the help and support of the people on that board, I'm not sure how well we would have done. They are a wonderful source of information for all of your questions.