Final answer:
The finding that requires further assessment is the history of asthma.
Step-by-step explanation:
The finding that requires further assessment in the context of a client undergoing a CT scan with an IV contrast agent is the history of asthma. Asthma is a respiratory condition that can be triggered by certain medications, including contrast agents. Therefore, it is essential for the nurse to assess the severity of the client's asthma, any recent exacerbations, and the client's current respiratory status before proceeding with the CT scan.