The APPEND score is a clinical decision rule and predictor of the likelihood of acute appendicitis.
Criteria
Each of the following are worth 1 point 1:
male gender
anorexia
migratory pain
localized peritonism
elevated CRP >15mg/L
neutrophilia >7.5x109/L
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.