How many patients classify a Level 4 multi-casualty event?

A Level 4 multi-casualty event is characterized by the presence of a significant number of patients requiring medical attention, typically defined as 101 to 1000 patients. In emergency management, multi-casualty incidents are categorized based on the volume of patients, which helps to determine the resources and response needed.

Level 4 indicates a major incident where the healthcare system could be significantly overwhelmed, necessitating a coordinated and often large-scale response from multiple agencies and resources. This level of casualty could arise from events such as major disasters or attacks, where extensive support systems must be activated to manage the influx of patients requiring care.

Thus, understanding the classification of multi-casualty events is crucial for emergency responders to ensure that adequate planning and resources are in place for effective management of such situations.