If your vet uses Idexx labs, a pre of either 7 and under or 10 and under (can't remember) is normal. A post of 15 or below is good but Dr. Center says 25 and below.
She is fasted for 12 hours (the protocol has changed on this but this is still the one most vets use and it is okay), then blood is drawn, then she is fed, then blood is drawn again in 2 hours. The vet should supply the food and they can force feed if necessary. Human food would be the last resort because you wouldn't know the protein and fat amount she is getting.
Another way to do the bile acids test is with a urine sample but that is not the best way, so no they should not be taking urine. Some vets will let dogs go home in between blood draws but you can't let her eat... That way you avoid the hospitalization fee if they were going to charge you and the dog is happier.
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