PAS = respiratory-rate component + oxygen requirement + auscultation + retractions + dyspnoea. Each component scores 1-3 points; total range is 5-15.

Component	1 point	2 points	3 points
Oxygen requirement	SpO2 >95% on room air	SpO2 90-95% on room air	SpO2 <90% on room air or any supplemental oxygen
Auscultation	Normal breath sounds to end-expiratory wheeze only	Expiratory wheezing	Inspiratory and expiratory wheezing or diminished breath sounds
Retractions	None or intercostal only	Intercostal and substernal	Intercostal, substernal and supraclavicular
Dyspnoea	Speaks in sentences, coos, or babbles	Partial sentences or short cry	Single words or short phrases, or grunting

Respiratory-rate component by age:

Age	1 point	2 points	3 points
2-3 years	≤34/min	35-39/min	≥40/min
4-5 years	≤30/min	31-35/min	≥36/min
6-12 years	≤26/min	27-30/min	≥31/min
>12 years	≤23/min	24-27/min	≥28/min

Pediatric Asthma Score (PAS)