Which of the following tasks cannot be delegated by a nurse?

The task of centrally inserting a catheter cannot be delegated by a nurse because it requires advanced clinical judgment, specialized training, and a comprehensive understanding of the procedure's complexities. Such tasks involve significant risk, the need for sterile technique, and the potential for complications that require immediate assessment and intervention. Only licensed professionals, such as registered nurses or experts trained in this specific invasive procedure, are qualified to perform it due to these factors.

In contrast, insulin administration can be delegated in certain settings where trained personnel are involved, as can activities like caring for a single client or providing bandage changes, assuming appropriate training and competency have been verified. These tasks generally fall within the scope of practice for trained assistive personnel and can be performed with clear protocols, making them suitable for delegation by a nurse in accordance with Washington State regulations.