Table 1.

Summary of the National Early Warning Score system, with the thresholds of the system outlined. For a given set of vital signs measurements, each variable is compared against its respective threshold and assigned a score accordingly. The patient’s overall score is the summation of scores assigned to all variables.

Vital sign	Score
	3	2	1	0	1	2	3
Heart rate (beats/min)	≤40	N/Aa	41-50	51-90	91-110	111-130	≥131
Oxygen saturation (%)	≤91	92-93	94-95	≥96	N/A	N/A	N/A
Temperature (°C)	≤35	N/A	35.1-36.0	36.1-38.0	38.1-39.0	≥39.1	N/A
Systolic blood pressure (mm Hg)	≤90	91-100	101-110	111-219	N/A	N/A	≥220
Respiratory rate (breaths/min)	≤8	N/A	9-11	12-20	N/A	21-24	≥25
Level of consciousness	N/A	N/A	N/A	Alert	N/A	N/A	Voice, pain, or unresponsive
Supplementary oxygen	N/A	Yes	N/A	No	N/A	N/A	N/A

^aN/A: not applicable.