Pediatric Appendicitis Score Calculator

Pediatric Appendicitis Score Calculator for Pediatrics. The result distinguishes totals at most two, three through six, and at least seven. Three is in the indeterminate group, not a low-score rule-out group. Reassessment and appropriate imaging or specialty assessment depend on the clinical context, not an automatic operation instruction.

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

The PAS sums five explicitly assessed symptoms or examination findings plus temperature, white-cell count and absolute neutrophil count. Right lower abdominal tenderness and tenderness with cough, percussion or hopping contribute two points each. Other positive criteria contribute one; the thresholds are temperature above 38 C, white cells above 10 x 10^9/L and neutrophils above 7.5 x 10^9/L.

When to use this calculator

Use the score as an assessment aid for a child aged one through 17 with abdominal pain lasting less than seven days, matching the cited prospective cohort. The form requires all findings and laboratories; unknown findings are not silently counted as absent.

Inputs used

  • Age (years)
  • Duration of abdominal pain (days)
  • Pain migrated to the right lower abdomen?
  • Appetite loss established?
  • Nausea or vomiting present?
  • Right lower abdominal tenderness present?
  • Right lower abdominal tenderness with cough, percussion or hopping?
  • Measured temperature (C)
  • White blood cell count (10^9/L)
  • Absolute neutrophil count (10^9/L)

Clinical interpretation

The result distinguishes totals at most two, three through six, and at least seven. Three is in the indeterminate group, not a low-score rule-out group. Reassessment and appropriate imaging or specialty assessment depend on the clinical context, not an automatic operation instruction.

Worked example

With all five clinical findings present, temperature 38.1 C, white cells 10.1 x 10^9/L and neutrophils 7.6 x 10^9/L, PAS is 10. Removing migration gives 9. Temperature exactly 38, white cells exactly 10 and neutrophils exactly 7.5 do not add their respective points.

Limitations and safety notes

PAS performance varies across settings and an early presentation may evolve. The prospective validation has a published erratum; no sensitivity or predictive-value claims are reproduced. The calculator checks arithmetic and rejects an absolute neutrophil count above the total white count but cannot confirm the examination or laboratory sample.

Frequently asked questions

Does PAS three exclude appendicitis?

No. Scores three through six are indeterminate and need further clinical assessment.

Can missing neutrophils be entered as zero?

No. An unknown result is not a normal result; the form requires a measured absolute count.

Does a high PAS mandate surgery?

No. It supports clinical assessment but does not replace imaging decisions or surgical evaluation.

References

  • PAS prospective population, weighted criteria, strict temperature/laboratory thresholds,3-6 indeterminate group and linked erratum. https://pubmed.ncbi.nlm.nih.gov/18534219/
  • Original PAS identity and weighted clinical construct; no diagnostic accuracy guarantee copied. https://pubmed.ncbi.nlm.nih.gov/12037754/

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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