What does the AVPU system measure in first aid?

The AVPU system is a method used to assess a patient's level of conscious responsiveness. It stands for Alert, Voice, Pain, and Unresponsive, which are the different responses a patient may exhibit during an assessment. This system allows first aid responders to quickly determine how alert a patient is and how they react to different stimuli, which is crucial for understanding the severity of their condition and deciding on the necessary interventions. By categorizing responses, the AVPU system helps in evaluating whether a patient may require immediate medical attention or how stable they are in a given situation.