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Psoriasis Area and Severity Index (PASI)

Quantifies plaque-psoriasis severity across 4 body regions.

INSTRUCTIONS

Use this calculator to score erythema, induration/thickness, desquamation/scaling, and area for each body region. Apply the result as an educational summary of plaque-psoriasis severity.

Head/neck erythema*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Head/neck induration/thickness*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Head/neck desquamation/scaling*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Percentage of head/neck affected*

0%0

1-9%+1

10-29%+2

30-49%+3

50-69%+4

70-89%+5

90-100%+6

Upper limbs erythema*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Upper limbs induration/thickness*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Upper limbs desquamation/scaling*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Percentage of upper limbs affected*

0%0

1-9%+1

10-29%+2

30-49%+3

50-69%+4

70-89%+5

90-100%+6

Trunk erythema*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Trunk induration/thickness*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Trunk desquamation/scaling*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Percentage of trunk affected*

0%0

1-9%+1

10-29%+2

30-49%+3

50-69%+4

70-89%+5

90-100%+6

Lower limbs erythema*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Lower limbs induration/thickness*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Lower limbs desquamation/scaling*

None0

Slight+1

Moderate+2

Severe+3

Very severe+4

Percentage of lower limbs affected*

0%0

1-9%+1

10-29%+2

30-49%+3

50-69%+4

70-89%+5

90-100%+6

Result:

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