The Bullous Pemphigoid Disease Activity Index (BPDAI) includes several measures of bullous pemphoid. One of these measures disease activity in the form of erosions and blisters. The authors are from multiple sites from around the world.
Patient selection: bullous pemphigoid
Sites:
(1) head
(2) neck
(3) chest
(4) left arm
(5) right arm
(6) hands
(7) abdomen
(8) genitals
(9) back and buttocks
(10) left leg
(11) right leg
(12) feet
Lesions
Points
none
0
1 to 3, all <= 1 cm
1
1 to 3, one or more > 1 cm
2
> 3, all <= 2 cm
3
> 3, one or more > 2 cm, all <= 5 cm
5
> 3 lesions, one or more > 5 cm
10
entire area of site
10
total score =
= SUM(points for all 12 areas)
activity score =
= (total score) / 120
Interpretation:
• minimum activity score: 0
• maximum activity score: 1
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