Which intervention is NOT part of the life-saving interventions performed in a Mass Casualty Incident (MCI)?

In the context of a Mass Casualty Incident (MCI), the focus is on quickly identifying and performing life-saving interventions on patients to maximize the number of lives saved. The interventions that are prioritized include controlling major hemorrhage, opening the airway, and administering medications like auto-injector antidotes when necessary.

Checking for spinal injuries, while it is a critical assessment in emergency care, does not fall into the immediate life-saving category in an MCI scenario. Given the need for rapid triage and treatment in such events, the time spent assessing spinal injuries can hinder the response to more critical life-threatening conditions such as severe bleeding or compromised airways, which require immediate attention.

Therefore, among the options provided, checking for spinal injuries is not considered a priority life-saving intervention during an MCI, making it the best choice for this question. The emphasis is on rapid stabilization and triage of the most critical patients, rather than comprehensive assessments that may delay essential interventions.