II. Criteria
- Age
- Score 1.0: Age <=40 years
- Score 0.5: Age >40 years
- Gender
- Score 1.0: Male
- Score 0.5: Female
- Duration
- Score 1.0: <=48 hours
- Score 0.5: >48 hours
- Symptoms
- Score 1: Anorexia
- Score 1: Nausea or Vomiting
- Score 0.5: Pain migration
- Score 0.5: Right Lower Quadrant Abdominal Pain
- Signs
- Score 1: Fever
- Score 2: Abdominal guarding
- Score 1: Abdominal Rebound Pain
- Score 1: Right lower quadrant abdominal tenderness
- Score 2: Rosving Sign
- Labs
- Score 1: Leukocytosis (WBC >10k/uL)
- Score 1: Negative Urinalysis
III. Interpretation
- Score >=7.5 (positive cutoff) suggests higher likelihood of Acute Appendicitis
IV. Efficacy
- Validated in heterogeneous population in the middle east and asia
- Test Sensitivity: 93%
- Test Specificity: 81%
- Positive Likelihood Ratio: 4.90
- Negative Likelihood Ratio: 0.086