What factor should the nurse consider when preparing a client with a brain tumor for a CT scan?

When preparing a client with a brain tumor for a CT scan, it is crucial to consider any allergies the client may have, particularly to contrast agents that might be used during the scan. Some contrast materials can provoke allergic reactions in sensitive individuals, leading to symptoms ranging from mild hives to severe anaphylactic shock. Knowing whether a client has a history of allergic reactions, such as hives from shrimp, is essential because shellfish allergies can sometimes indicate a higher risk for contrast material allergies.

While factors like previous surgeries, the client's age, and current medications are relevant in the overall assessment of the client's health and planning of care, they are not as immediate and critical in the context of potential complications arising from a CT scan. Ensuring the client's safety regarding allergies takes precedence in this scenario, as it directly affects the procedure's risk management.