Paediatrics · Emergency Medicine · Surgery
Pediatric Appendicitis Risk Calculator calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 5–18.9 years
From 5 through 18.9 years. Girls from 12 years and boys from 14 years are the reference row.
Allowed range: 0–50000 cells/µL
Below 14 ×10^3/µL the term is 1.77 times the square root. At 14 or above, add 6.62.
Result
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Clinical inputs
- Age (years)Accepted range: 5 to 18.9
- Sex
- Duration of pain
- Pain with walking
- Pain migrated to the right lower quadrant
- Maximal tenderness in the right lower quadrant
- Abdominal guarding
- Absolute neutrophil count (×10^3/µL)Accepted range: 0 to 50
Primary source
Kharbanda AB et al. Development and Validation of a Novel Pediatric Appendicitis Risk Calculator (pARC). Pediatrics. DOI: 10.1542/peds.2017-2699. PMID: 29535251. Logit = −8.7 + male 1.28 + age 5–7.9 years 0.38 + male and age 5–7.9 years −1.05 + age 8–13.9 years −0.72, with male 14–18 years and female 12–18 years as the reference. Pain 24 to under 48 hours adds 0.47 and 48–96 hours adds 0.10. Pain with walking adds 1.05, migration to the right lower quadrant adds 0.46, maximal tenderness there adds 1.14, and guarding adds 0.67. Absolute neutrophil count below 14 ×10^3/µL adds 1.77 × square root of that count; at 14 or above, add the constant 6.62. Risk percent is 100 / (1 + e^(−logit)). The paper strata are under 5%, 5–14%, 15–24%, 25–49%, 50–74%, 75–84%, and 85% or higher. (2018)
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