Paediatrics · Emergency Medicine · Pulmonology

Pediatric Asthma Score (PAS) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Respiratory rate for age

Breaths per minute. Boundary values are inclusive as in published reproductions of the score: for example, at 2-3 years a rate of 34 scores 1 and a rate of 40 scores 3.

Pulse oximetry (SpO2)

Cutoffs as printed in the guideline that cites Kelly 2000. Some later published versions use lower cutoffs (above 90%, 85-90%, below 85%).

Auscultation

Retractions

Dyspnea

Result

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Primary source

Kelly CS, Andersen CL, Pestian JP, et al. Improved outcomes for hospitalized asthmatic children using a clinical pathway. Ann Allergy Asthma Immunol. 2000;84(5):509-516. DOI: 10.1016/S1081-1206(10)62514-8. PMID: 10831004. Scoring table read from the Children's Mercy Kansas City asthma exacerbation clinical practice guideline (Severity of Asthma Exacerbation), which cites Kelly 2000. Each of five items scores mild 1, moderate 2, severe 3. Respiratory rate (/min): 2-3 years <=34, 35-39, >=40; 4-5 years <=30, 31-35, >=36; 6-12 years <=26, 27-30, >=31; over 12 years <=23, 24-27, >=28 (the guideline prints < and >, leaving the boundary values unassigned; the inclusive limits are as printed in the peer-reviewed reproductions Maue DK et al. World J Clin Pediatr 2017;6(1):34-39, DOI 10.5409/wjcp.v6.i1.34, Table 1, and Nepal J Paediatr Soc PAS validation, Table 1). Pulse oximetry: >95%, 90-95%, <90% on room air (some later versions use >90%, 85-90%, <85%). Auscultation: normal or end-expiratory wheeze; expiratory wheezing; inspiratory and expiratory wheeze or diminished breath sounds. Retractions: none or intercostal; intercostal and substernal; intercostal, substernal and supraclavicular. Dyspnea: speaks in sentences (coos and babbles); partial sentences (short cry); single words or short phrases (grunting). Score 5-7 mild, 8-11 moderate, 12-15 severe. (2000)

Scope: Children aged 2 years and older with an acute asthma exacerbation. It grades severity from five bedside signs and does not set treatment by itself.

Last reviewed 2026-10-18

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Kelly CS, Andersen CL, Pestian JP, et al. Improved outcomes for hospitalized asthmatic children using a clinical pathway. Ann Allergy Asthma Immunol. 2000;84(5):509-516. DOI: 10.1016/S1081-1206(10)62514-8. PMID: 10831004. Scoring table read from the Children's Mercy Kansas City asthma exacerbation clinical practice guideline (Severity of Asthma Exacerbation), which cites Kelly 2000. Each of five items scores mild 1, moderate 2, severe 3. Respiratory rate (/min): 2-3 years <=34, 35-39, >=40; 4-5 years <=30, 31-35, >=36; 6-12 years <=26, 27-30, >=31; over 12 years <=23, 24-27, >=28 (the guideline prints < and >, leaving the boundary values unassigned; the inclusive limits are as printed in the peer-reviewed reproductions Maue DK et al. World J Clin Pediatr 2017;6(1):34-39, DOI 10.5409/wjcp.v6.i1.34, Table 1, and Nepal J Paediatr Soc PAS validation, Table 1). Pulse oximetry: >95%, 90-95%, <90% on room air (some later versions use >90%, 85-90%, <85%). Auscultation: normal or end-expiratory wheeze; expiratory wheezing; inspiratory and expiratory wheeze or diminished breath sounds. Retractions: none or intercostal; intercostal and substernal; intercostal, substernal and supraclavicular. Dyspnea: speaks in sentences (coos and babbles); partial sentences (short cry); single words or short phrases (grunting). Score 5-7 mild, 8-11 moderate, 12-15 severe. (2000)

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Clinical inputs

Respiratory rate for age
Pulse oximetry (SpO2)
Auscultation
Retractions
Dyspnea

Primary source

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