I'm sorry
It sounds like he was fasted for surgery and they just took a fasting (pre-meal) sample this time? If that is the case, that is very high for a pre-meal sample. Most likely his post-meal sample will be much higher when you redo the bile acid test. It's always important to have a paired sample around a meal time for most accurate results.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.