Do you have to fast before liver bio with ultra sound guided?

Most likely: Any time there is a procedure, it usually good to have an empty stomach. If you become "sick", it is best to vomit without food in the stomach to avoid aspiration. Sometimes the proceduralist will allow a small amount of liquids. If you were to have a complication, it is best to have an empty stomach to avoid these and many other complications. If in doubt, call the doctor or place you go.