The Pemphigus Disease Activity Index (PDAI) has several subscores describing disease activity and damage. One subscore is for activity affecting the scalp. The PDAI was developed by the International Pemphigus Definitions Committee.
Patient selection: pemphigus
Parameters
(1) number of quadrants showing erosions, blisters or new erythema
(2) number of lesions > 6 cm in diameter
Parameter
Finding
Points
number of quadrants
0
0
1
1
2
2
3
3
4 (whole skull)
4
number of lesions > 6 cm
0
0
>= 1
10
score for the scalp=
= MAX(points for each of the 2 scores)
Interpretation:
• minimum score: 0
• maximum score: 10
• The higher the score the greater the involvement of the scalp.
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