Psoriasis Area And Severity Index (Pasi) Worksheet - British Association Of Dermatologists

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PSORIASIS AREA AND SEVERITY INDEX (PASI) WORKSHEET
HOSPITAL NO.:
.
PATIENT NAME:
.
DATE OF VISIT:
.
The Psoriasis Area and Severity Index (PASI) is a quantitative rating score for measuring the
severity of psoriatic lesions based on area coverage and plaque appearance.
Plaque characteristic
Lesion score
Head
Upper Limbs
Trunk
Lower Limbs
0 = None
Erythema
1 = Slight
Induration/Thickness
2 = Moderate
3 = Severe
Scaling
4 = Very severe
Add together each of the 3 scores for each body region to give 4 separate sums (A).
Lesion Score Sum (A)
Percentage area
Area score
Head
Upper Limbs
Trunk
Lower Limbs
affected
0 = 0%
Area Score (B)
1 = 1% - 9%
Degree of involvement as a
2 = 10% - 29%
percentage for each body
3 = 30% - 49%
region affected (score each
4 = 50% - 69%
region with score between
5 = 70% - 89%
0-6)
6 = 90% - 100%
Multiply Lesion Score Sum (A) by Area Score (B), for each body region, to give 4 individual subtotals (C).
Subtotals (C)
Multiply each of the Subtotals (C) by amount of body surface area represented by that region, i.e. x 0.1 for head, x
0.2 for upper body, x 0.3 for trunk, and x 0.4 for lower limbs.
Body Surface Area
x 0.1
x 0.2
x 0.3
x 0.4
Totals (D
)
Add together each of the scores for each body region to give the final PASI Score.
PASI Score =

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