Get ready for this "Total Parenteral Nutrition TPN-IV Quiz." Parenteral nutrition is the feeding of nutritional products to a person intravenously, bypassing the usual process of eating and digestion. It is used to help people who can't or shouldn't get their core nutrients from food; the person gets to receive nutritional formulae that contain nutrients and dietary minerals. Test your understanding of this by taking the quiz below. Best of luck to you!