the nurse ask about the stools because: Someone with difficulty converting bilirubin into bile will have trouble digesting fats, and they will go out in the stool.
Biliburin consists of Fat-soluble vitamins that will absorb the fats that needed to be excreted from our body. If someonehase a difficulty converting bilirubin, the fats will stay at the small intestine and have to be manually excreted using medical equipment.