Summary of criteria for activation of the medical emergency team (MET) system
| Airway | Airway threatened (stridor) |
| Breathing | Acute change to respiratory rate (<8 or >36 breaths/min) |
| Acute change SpO2 <90% despite 10 litres supplemental O2 | |
| Circulation | Acute change in heart rate (<40 or >140 beats/min) |
| Acute change in systolic blood pressure <90 mm Hg | |
| Level of consciousness | Acute change in level of consciousness |
| Worried | Medical personnel ‘worried’ about the patient |
SpO2, oxygen saturation.