EASI score
An EASI score is a tool used to measure the severity and extent of atopic eczema (Eczema Area and Severity Index). It takes a few minutes and experience to calculate it accurately.
Intensity
A representative area of eczema is selected for each body region. The intensity of redness (erythema), thickness (induration, papulation, oedema), scratching (excoriation) and lichenification (lined skin) of the eczema is assessed as none (0), mild (1), moderate (2) and severe (3). Half scores are allowed.
| Intensity | Absent | Mild | Moderate | Severe |
| Redness |
Score 0 |
Score 1 |
Score 2 |
Score 3 |
| Thickness |
Score 0 |
Score 1 |
Score 2 |
Score 3 |
| Scratching |
Score 0 |
Score 1 |
Score 2 |
Score 3 |
| Lichenification |
Score 0 |
Score 1 |
Score 2 |
Score 3 |
Calculation for intensity
The four intensity scores are added up for each of the four body regions to give subtotals A1, A2, A3, A4.
Each subtotal is multiplied by the body surface area represented by that region.
- A1 x 0.1 gives B1 (in children 0-7 years, A1 x 0.2 gives B1)
- A2 x 0.2 gives B2
- A3 x 0.3 gives B3
- A4 x 0.5 gives B4 (in children 0-7 years, A1 x 0.3 gives B1)
Area
The percentage area affected by psoriasis is evaluated in the four regions of the body. In each region, the area is expressed as nil (0), 1-9% (1), 13-29% (2), 30-49% (3), 50-69% (4), 70-89% (5) or 90-100% (6).
- Head and neck
- Upper limbs
- Trunk
- Lower limbs
Calculations for area
Each of the body area scores is multiplied by the area affected.
- B1 x (0 to 6)= C1
- B2 x (0 to 6)= C2
- B3 x (0 to 6)= C3
- B4 x (0 to 6)= C4
Total score
The EASI score is C1 + C2 + C3 + C4.
Related information
References:
- Hanifin JM, Thurston M, Omoto M, Cherill R, Tofte SJ, Graeber M. The eczema area and severity index (EASI): assessment of reliability in atopic dermatitis. EASI Evaluator Group. Exp Dermatol. 2001 Feb;10(1):11-8.
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