Which IV site is most appropriate for a client who is ordered to receive total parental nutrition?

Administration of total parenteral nutrition (TPN) requires a vascular access route that can safely handle highly hypertonic solutions. Because TPN contains concentrated glucose, amino acids, and lipids, it must be delivered into a high-flow central vein to prevent vascular irritation and thrombophlebitis. Selection of the correct IV site is essential to ensure adequate dilution, prevent complications, and maintain catheter patency during long-term therapy. A. A hemodialysis setup, which is used for renal replacement therapy to filter waste products, excess fluids, and electrolytes from the blood in clients with kidney failure. It is not an appropriate or safe route for administering total parenteral nutrition (TPN), as dialysis access is designed for extracorporeal blood circulation rather than infusion of hypertonic nutritional solutions. B. A central venous catheter (such as a subclavian, internal jugular, or PICC line) is the correct site for TPN administration. These large veins allow rapid dilution of hyperosmolar solutions in high blood flow, reducing the risk of vascular damage. Central access is specifically recommended for long-term nutritional support and is the standard for TPN therapy. C. A peripheral IV site in the forearm or hand is not appropriate for TPN administration. Peripheral veins are small and unable to tolerate the hyperosmolar nature of TPN solutions. Infusing TPN through a peripheral line can lead to phlebitis, infiltration, and tissue necrosis. These complications occur because the solution is too concentrated for peripheral circulation. D. A midline or extended peripheral catheter is still considered peripheral access and is not suitable for TPN administration. Although it reaches deeper veins than a standard IV, it does not terminate in a central vein with high blood flow. Therefore, it cannot safely accommodate the hypertonic composition of TPN, increasing the risk of thrombosis and infiltration.