The Pemphigus Disease Activity Index (PDAI) has several subscores describing disease activity and damage. One subscore is for activity affecting mucous membranes. The PDAI was developed by the International Pemphigus Definitions Committee.
Regions:
(1) eyes
(2) nose
(3) buccal mucosa
(4) hard palate
(5) soft palate
(6) upper gingiva
(7) lower gingival
(8) tongue
(9) floor of mouth
(10) labial bucosa
(11) posterior pharynx
(12) anogenital
Scoring:
(1) number of lesions
(2) number of lesions > 2 cm in diameter
(3) number of lesions involving an entire region
Parameter
Finding
Points
number of lesions
0
0
1
1
2 or 3
2
>= 4
5
number of lesions > 2 cm
0 or 1
0
>= 2
5
lesion covering entire region
absent
0
present
10
score for a region =
= MAX(points for each of the 3 scores)
subscore for all of the mucous membranes =
= SUM(points for all 12 regions)
Interpretation:
• minimum score: 0
• maximum score: 120
• The higher the score the greater the involvement of the mucous membranes.
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