Total parenteral nutrition (TPN) provides all the nutrients and calories a person needs directly through a vein. TPN is used when someone can't eat or absorb nutrients through their stomach and intestines.
Total parenteral nutrition (TPN) is a method of feeding that bypasses the gastrointestinal tract. A special formula given through a vein provides most of the nutrients the body needs.
It is called total parenteral nutrition (TPN) or total nutrient admixture (TNA) when no significant nutrition is obtained by other routes, and partial parenteral nutrition (PPN) when nutrition is also partially enteric.