When is total parenteral nutrition necessary?

TPN: Parenteral nutrition is necessary when a person cannot take anything by mouth due to small intestinal diseases such as obstruction, crohn's disease, acute pancreatitis etc.

Necessary...: Total parenteral nutrition, tpn, is needed when the gut is not functional for any reason. There are many scenarios when it becomes necessary including post-op from a surgery on the intestines, massive trauma, infections causing massive vommiting, hyperemesis of pregnancy, etc.

No use GUT: when you are unable to absorb your food from your intestinal tract, then TPN is necessary. Examples might include after intestinal surgery of a large part of the small intestines. During cancer chemotherapy, the chemotherapy causes such severe damage to the intestinal tract, TPN might be indicated for ongoing nutritional support.