Appendicitis Inflammatory Response Score

By Dr. Costa / June 14, 2026

Appendicitis Inflammatory Response (AIR) Score Calculator

AIR Score Calculator

Appendicitis Inflammatory Response Score for suspected acute appendicitis

1. Vomiting

No vomiting — 0 points Vomiting present — 1 point

2. Pain in right iliac fossa / right lower quadrant

Absent — 0 points Present — 1 point

3. Rebound tenderness or muscular defense

None — 0 points Light — 1 point Medium — 2 points Strong — 3 points

4. Body temperature

< 38.5°C — 0 points ≥ 38.5°C — 1 point

5. Neutrophil percentage

< 70% — 0 points 70–84% — 1 point ≥ 85% — 2 points

6. White blood cell count

< 10.0 × 10⁹/L — 0 points 10.0–14.9 × 10⁹/L — 1 point ≥ 15.0 × 10⁹/L — 2 points

7. C-reactive protein

< 10 mg/L — 0 points 10–49 mg/L — 1 point ≥ 50 mg/L — 2 points

Clinical note: This calculator is for educational and clinical decision-support use only. It does not replace clinical assessment, imaging when indicated, surgical consultation, or local guidelines. Suspected appendicitis can be urgent.

References

Andersson M, Andersson RE. The Appendicitis Inflammatory Response score: a tool for diagnosis of acute appendicitis. World Journal of Surgery. 2008.
Di Saverio S, et al. Diagnosis and treatment of acute appendicitis: 2020 update of the WSES Jerusalem guidelines. World Journal of Emergency Surgery. 2020.
Radiopaedia. AIR score reference article.
openEHR Clinical Knowledge Manager. Appendicitis Inflammatory Response Score archetype.

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