What step should you take first when evaluating a casualty?

When evaluating a casualty, the first step should be to check for response. This step is crucial because it helps determine the level of consciousness and responsiveness of the individual. It is essential to establish whether the person is awake, alert, or responsive to stimuli. Assessing response sets the stage for subsequent evaluations and interventions. If the person responds, you can engage further and assess their specific needs or injuries. If they do not respond, it indicates a more severe situation where immediate medical assistance may be required.

This approach aligns with the principles of first aid, where recognizing the status of a casualty is a critical priority. Understanding the response can guide further actions, such as checking breathing and pulse or initiating CPR if necessary.