Table 1.

Variables used by different scoring systems to trigger referral to a critical care service

	Critical care service [reference]
Variable	MET [36]	MET [63]	MET [62]	PART [54]	CCLS [56]	EWS [64]	MEWS [65,66]
Airway
Breathing
SpO2/arterial blood gas
Respiratory rate
Circulation
Heart rate
Systolic blood pressure
Neurology
Renal
Temperature
Clinical concern

CCLS, critical care liaison service; EWS, early warning scoring system; MET, medical emergency team; MEWS, modified early warning score; PART, patient at risk team; SpO₂, pulse oximeter oxygen saturation.