A nurse on the day shift is preparing to change a client's total parenteral nutrition (TPN) solution, but the new TPN solution has not arrived from the pharmacy. The client received additional IV fat emulsion during the night shift. Which of the following actions should the nurse take?

Choice A reason: Saline locking the IV catheter would interrupt the continuous infusion of nutrients and glucose, potentially leading to hypoglycemia and metabolic instability. TPN-dependent clients require a steady supply of glucose and electrolytes. Choice B reason: Calling the provider for new TPN orders may be necessary if the delay is prolonged, but it is not the immediate action to maintain the client's metabolic needs. The nurse must act to prevent hypoglycemia and maintain fluid balance. Choice C reason: Hanging IV fat emulsion alone does not provide adequate glucose or amino acids. Lipid emulsions are supplemental and cannot replace the carbohydrate and protein components of TPN. They are not suitable as a standalone substitute. Choice D reason: Hanging D10W is the appropriate action when TPN is temporarily unavailable. It provides a source of glucose to prevent hypoglycemia and maintains the infusion line until the full TPN solution arrives. This is a standard protocol in TPN management.