EASI (Eczema Area and Severity Index): Validated tool for measuring the extent and severity of atopic dermatitis.
Head & Neck (10%)
Trunk (30%)
Upper Limbs (20%)
Lower Limbs (40%)
Guidelines & Evidence
Clinical Details
Section 1
When to Use
When to Use
Quantifying the severity and extent of atopic dermatitis.
Standardized outcome measure widely required in clinical trials for new AD treatments.
Determining eligibility for biologics (e.g., Dupilumab)
Section 2
Formula & Logic
Calculation Steps
Body divided into 4 regions: Head/Neck (10%), Upper Limbs (20%), Trunk (30%), Lower Limbs (40%). For children <8 years, head is 20%, trunk 30%, upper 20%, lower 30%.
Severity signs: Erythema, Induration/Papulation, Excoriation, Lichenification. Each graded 0-3.
Area of involvement graded 0-6 (similar to PASI).
Region Score = (Sum of severity signs) × Area Score × Region Multiplier.
Total Score = Sum of Region Scores (Max 72).
Section 3
Pearls/Pitfalls
Clinical Pearls
Unlike SCORAD, EASI only includes objective physician assessment and does not factor in patient-reported pruritus or sleep loss.
EASI is highly sensitive to changes in severely extended disease.
Evaluate the average intensity of the signs across the entire involved area within a specific region.
