for adults/adolescents, you should call/activate ems

For adults and adolescents, you should call or activate Emergency Medical Services (EMS) before providing CPR in an emergency situation. Calling EMS first ensures that professional medical help is on the way while you begin life-saving interventions like CPR or using an AED (Automated External Defibrillator) if available. This is the recommended protocol for emergencies involving adults and adolescents to increase the chances of survival.