Final answer:
In this situation, the next step would be to check for responsiveness.
Step-by-step explanation:
If an adult in the waiting room has collapsed to the floor and appears unresponsive without life-threatening bleeding, the next step is to check for responsiveness. This involves gently shaking the person and asking if they are okay. If there is no response, the person is unconscious and further steps need to be taken, such as opening the airway, checking for breathing and a pulse, and providing CPR if necessary.