[header] How to evaluate for head injuries during first aid [title] Make sure the person is conscious. [step] While the person may still be awake, there can be other concerns. You'll want to check him quickly to see if he is alert and responsive. 
One good way to check is using the avpu responsiveness scale : [substeps] Alert: look to see if he is alert, with eyes open. Does he respond to questions? Verbal: ask simple questions, and see if he is able to answer them.