Alvarado and AIR scoring systems and risk grouping
| Variables | Alvarado | AIR |
| Nausea and/or vomiting | 1 | – |
| Vomiting | – | 1 |
| Anorexia | – | |
| RIF pain | 1 | |
| Migratory pain to RIF | – | |
| Rebound tenderness | 1 | – |
| Rebound light | – | 1 |
| Medium | – | 2 |
| Strong | – | 3 |
| Temperature >37.3 | 1 | – |
| Temperature >38.5 | – | 1 |
| WCC >10×109/L | 2 | – |
| WCC 10–14.9×109/L | – | 1 |
| WCC ≥15×109/L | – | 2 |
| PMN leucocytes | ||
| >75% | 1 | – |
| 70%–84% | – | 1 |
| ≥85% | – | 2 |
| CRP | ||
| 10–49 | – | 1 |
| ≥50 | – | 2 |
| Total score | ||
| Low risk/probability | 0–4 | 0–4 |
| Medium risk/probability | 5–6 | 5–8 |
| High risk/probability | 7–10 | 9–12 |
AIR, Appendicitis Inflammatory Response; CRP, C-reactive protein; PMN, polymorphonuclear neutrophils; RIF, Right iliac Fossa; WCC, white cell count.