The Simplified Psoriasis Index (SPI) is intended to be a clinically useful method of assessing psoriasis. There are several assessments which may be conducted by the provider (professional) or patient (self assessment). The authors are from the University of Manchester and Mahidol University in Bangkok.
Patient selection: psoriasis
Parameters in provider assessment.
(1) skin involvement
(2) current average severity
Skin involvement:
(1) scalp
(2) face and anterior neck
(3) arms
(4) hands
(5) front torso
(6) back torso
(7) genital and perineum
(8) thighs
(9) lower legs
(10) feet
|
Activity
|
Points
|
|
clean, minimal, no more than a few scattered, thin plaques
|
0
|
|
obvious but plenty of normal skin
|
0.5
|
|
widespread and involving most of the affected area
|
1
|
subscore for skin involvement =
= SUM(points for all of the parameters)
|
Current Average Intensity
|
Points
|
|
essentially clear
|
0
|
|
mild
|
1
|
|
mild-to-moderate
|
2
|
|
moderate
|
3
|
|
marked
|
4
|
|
intensely inflamed skin with or without pustules
|
5
|
current severity =
= (subscore for skin involvement) * (current average intensity)
Interpretation:
• minimum subscore for skin involvement: 0
• maximum subscore for skin involvement: 10
• minimum subscore for current average intensity: 0
• maximum subscore for current average intensity: 5
• minimum current severity: 0
• maximum current severity: 50
