General Surgery · Emergency Medicine

Appendicitis Inflammatory Response (AIR) Score calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Vomiting (+1)Pain in the right iliac fossa (+1)

Rebound tenderness or muscular defence

Body temperature ≥38.5°C (+1)

White blood cell count

Proportion of polymorphonuclear neutrophils

C-reactive protein

Result

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Andersson M, Andersson RE. The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score. World J Surg. DOI: 10.1007/s00268-008-9497-7. PMID: 18414934. Scope: AIR score (0–12) sums vomiting (+1), pain in the right iliac fossa (+1), rebound tenderness/muscular defence (light +1, medium +2, strong +3), temperature ≥38.5°C (+1), WBC 10.0–14.9×10⁹/L (+1) or ≥15.0 (+2), neutrophil proportion 70–84% (+1) or ≥85% (+2), and CRP 10–49 mg/L (+1) or ≥50 (+2). Bands: 0–4 low, 5–8 intermediate, 9–12 high probability. (2008)

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Clinical inputs

Vomiting (+1)
Pain in the right iliac fossa (+1)
Rebound tenderness or muscular defence
Body temperature ≥38.5°C (+1)
White blood cell count
Proportion of polymorphonuclear neutrophils
C-reactive protein

Primary source

Andersson M, Andersson RE. The appendicitis inflammatory response score: a tool for the diagnosis of acute appendicitis that outperforms the Alvarado score. World J Surg. DOI: 10.1007/s00268-008-9497-7. PMID: 18414934. Scope: AIR score (0–12) sums vomiting (+1), pain in the right iliac fossa (+1), rebound tenderness/muscular defence (light +1, medium +2, strong +3), temperature ≥38.5°C (+1), WBC 10.0–14.9×10⁹/L (+1) or ≥15.0 (+2), neutrophil proportion 70–84% (+1) or ≥85% (+2), and CRP 10–49 mg/L (+1) or ≥50 (+2). Bands: 0–4 low, 5–8 intermediate, 9–12 high probability. (2008)

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