cliot (version 1.0.0)

scarf_score: Sequential Clinical Assessment of Respiratory Function (SCARF) Score

Description

Calculates the SCARF score to predict the risk of progression to severe pneumonia (composite of mechanical ventilation or death) in patients hospitalized with COVID-19. The score is based on respiratory rate, oxygen saturation, and the number of lung lobes affected on imaging.

Usage

scarf_score(respiratory_rate, spo2, lobes_affected)

Value

A list containing:

SCARF_Score

The calculated total score (Range 0-17).

Risk_Category

Classification (Low, Moderate, High).

Risk_of_Severe_Pneumonia

Estimated probability of progression to severe pneumonia within 14 days.

Arguments

respiratory_rate

Numeric. Respiratory rate in breaths per minute. < 20: 0 pts. 20 - 24: 2 pts. 25 - 30: 4 pts. > 30: 6 pts.

spo2

Numeric. Oxygen saturation percentage (SpO2). > 96: 0 pts. 94 - 96: 2 pts. 90 - 93: 4 pts. < 90: 6 pts.

lobes_affected

Numeric. Number of lung lobes affected on Chest X-ray or CT (0-5). 0 - 1: 0 pts. 2 - 3: 2 pts. > 3: 5 pts.

References

Doshi A, Shah P, Jariwala P, et al. Sequential Clinical Assessment of Respiratory Function (SCARF) Score: A Dynamic Prognostic Score for COVID-19. J Assoc Physicians India. 2021;69(1):11-12.

Examples

# Example 1: Low Risk
# RR 18 (0), SpO2 98 (0), 1 Lobe (0)
# Score = 0
scarf_score(18, 98, 1)

# Example 2: High Risk
# RR 26 (4), SpO2 92 (4), 4 Lobes (5)
# Score = 13
scarf_score(26, 92, 4)