The Pediatric Asthma Severity Score (PASS) is a clinical calculator used to assess the severity of asthma in pediatric patients, typically those aged between 1 and 18 years. This scoring system is particularly useful in emergency department settings, where it aids in the decision-making process for hospitalization versus outpatient management. The PASS takes into account several clinical parameters including wheezing, air entry, and retractions, assigning a score to each. The total score then categorizes the asthma severity as mild, moderate, or severe. It is important to note that this calculator should not be used in children under 1 year of age, or in patients with other respiratory conditions that may mimic asthma symptoms, such as bronchiolitis or pneumonia.

Pediatric Asthma Severity Score (PASS)

# Criteria
 ## Wheezing
A. None or mild (+0)
B. Moderate (+1)
C. Severe or absent due to poor air movement (+2)
## Work of breathing (use of accessory muscles, retractions)
D. None or mild (+0)
E. Moderate (+1)
F. Severe (+2)
## Prolongation of expiration (expiration to inspiration ratio)
G. Normal or mildly prolonged (+0)
H. Moderately prolonged (+1)
I. Severely prolonged (+2)

# Conditions
- score <= 1
- score >= 2
- score == 0