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Table 1 The four-step triage classification of the ambulance calls. Class C and D calls are responded to without lights and sirens on and by observing speed limits and regular traffic rules

From: Prehospital characteristics of COVID-19 patients in Helsinki – experience of the first wave of the pandemic

Triage class Explanation
A A high-risk, life threatening situation with a suspected severe disturbance in vital signs or a high energy injury.
B A situation in which there is a disturbance in vital signs that might progress to be life-threatening without prompt EMS interventions.
C A situation where patient is stable and can wait for an ambulance. EMS responds within 30 min.
D A non-urgent situation. EMS responds within 120 min.