What should be done immediately if a client has an allergic reaction during a service?

If a client has an allergic reaction during a service, stopping the service and administering first aid if necessary is the most appropriate action to take. This immediate response prioritizes the safety and well-being of the client. Allergic reactions can range from mild to severe and may escalate quickly, so it's crucial to halt any ongoing procedures to prevent further exposure to allergens. Providing first aid can involve assessing the severity of the reaction and, if required, applying basic treatments such as using a cold compress or assisting the client in breathing, depending on the symptoms displayed.

In situations involving allergic reactions, timely intervention can significantly impact the client’s health, reducing the risk of complications. It is essential to focus on the client's needs first, securing a safe environment before proceeding with any further steps related to the service or notifying management.