Intravenous hypernutrition therapy refers to the input of fluids with a relatively high concentration of nutrients into a vein, especially into a central venous placement. For example, protein, fat and glucose are given in relatively high amounts and at higher concentrations than regular infusions. Intravenous hypernutrition therapy is often used in postoperative patients, patients with infections and patients with very poor nutrient intake who need to be given adequate nutrition to replace catabolic and metabolic substances. Because the amount of fluid input is somewhat limited, relatively high concentrations of nutrients need to be administered within the limited fluid volume.