What should the first due company do upon arriving at an MCI?

Upon arriving at a Mass Casualty Incident (MCI), the first due company must perform a thorough size-up and report. This action is crucial as it allows the incident commander and responding agencies to get a comprehensive understanding of the situation. Size-up involves assessing the scene for hazards, determining the number of victims, identifying the mechanism of injury, and evaluating resource needs. This initial assessment guides the priorities for treatment and resource allocation, ensuring that emergency responders can develop an effective incident action plan.

Establishing a clear situational overview aids in making informed decisions on how to proceed with patient care, which areas require immediate attention, and how to manage resources efficiently. This is critical in an MCI where the flow of information and coordination among various emergency services can greatly impact outcomes. By prioritizing size-up and communication, responders ensure that they are acting based on the best available information, rather than rushing into treatment without a solid understanding of the situation at hand.