Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Conceptual framework for critical time points in emergency care
CT: computed tomography; EMS; emergency medical services.
Note: Tier-1 providers are community-based voluntary or professional first responders whereas tier-2 providers are the paramedics, emergency medical technicians and ambulance technicians who provide specialized prehospital care.
