The APPEND score is a clinical decision rule and predictor of the likelihood of acute appendicitis.
Criteria 1
- male gender (1)
- anorexia (1)
- migratory pain (1)
- localized peritonism (1)
- elevated CRP > 15mg/L (1)
- neutrophilia >7.5x109/L (1)
APPEND refers to the mnemonic:
- A: anorexia
- P: pain (migratory)
- P: peritonism (localized)
- E: elevated CRP
- N: neutrophilia
- D: dude (male)
Score total:
- 0-1: low risk of acute appendicitis
- 2-4: intermediate risk of acute appendicitis
- 5-6: high risk of acute appendicitis
For a score of 1 (low risk of acute appendicitis), the NPV is 95.6% 2.
For a score of 5 (high risk of acute appendicitis), the PPV is 95.5% 2.