What is the numerical threshold for a 'mass casualty' incident?

What is the numerical threshold for a 'mass casualty' incident?

• A. 200 or more individuals.
• B. 100 or more individuals.
• C. 50 or more individuals.
• D. 20 or more individuals.

Answer: (B)

The defining idea is that an incident becomes a mass casualty when the number of victims overwhelms what usual response resources can handle. The commonly used numerical threshold is 100 or more people. This tipping point helps trigger higher-level incident command activation, expanded triage, and mobilization of additional personnel and supplies. Lower numbers don’t signal the same level of overwhelm, and while an event with more than 100 victims is certainly severe, the 100-or-more mark is the standard benchmark used in many EMS and disaster response training contexts.

The defining idea is that an incident becomes a mass casualty when the number of victims overwhelms what usual response resources can handle. The commonly used numerical threshold is 100 or more people. This tipping point helps trigger higher-level incident command activation, expanded triage, and mobilization of additional personnel and supplies. Lower numbers don’t signal the same level of overwhelm, and while an event with more than 100 victims is certainly severe, the 100-or-more mark is the standard benchmark used in many EMS and disaster response training contexts.