A nurse is reviewing the plan of care for a group of clients. The nurse should identify that informed consent is required for which of the following procedures?

A. Incorrect. Irrigation of a wound with antibiotic solution typically does not require informed consent. B. Incorrect. Insertion of a nasogastric tube does not usually require informed consent unless it involves specific risks or is part of a research protocol. C. Correct. Placement of a central venous catheter is an invasive procedure that involves risks, and informed consent is usually required. D. Incorrect. Administration of an iron injection using the Z-track technique is a routine procedure and does not usually require informed consent.