Tool	Link	Indications	Limitations
Psoriasis severity assessment
Body surface area	https://www.health.state.mn.us/communities/ep/surge/burn/tbsa.html	Used to calculate severity and assess response to treatment; good interrater reliability1	Can be overestimated
Nail Psoriasis Severity Index	https://www.sciencedirect.com/science/article/pii/S0190962203009101?via%3Dihub	Scores each nail for nail bed and nail matrix psoriasis to assess severity42	Weak consensus for use43
Physician Global Assessment	https://jamanetwork.com/journals/jamadermatology/fullarticle/2039085	Erythema, induration, and scaling used to measure severity and response to treatment; simple to use1	Does not consider body surface area
Psoriasis Area and Severity Index	https://www.mdcalc.com/calc/10182/psoriasis-area-severity-index-pasi	Erythema, induration, scaling, and affected body surface area used to determine severity and response to treatment1	Used in research trials and less often in the clinical setting; not accurate for mild psoriasis
Psoriasis Symptom Inventory	https://www.tandfonline.com/doi/full/10.3109/09546634.2012.742950	Patient-reported inventory that measures severity based on itch, redness, scaling, burning, stinging, cracking, flaking, and pain1	Relies on patient willingness and ability to complete
Quality-of-life assessment
Children’s Dermatology Life Quality Index	https://www.cardiff.ac.uk/medicine/resources/quality-of-life-questionnaires/childrens-dermatology-life-quality-index	Derived from the adult index and available in written and cartoon versions5	May be difficult to assess pruritus
Dermatology Life Quality Index	https://www.cardiff.ac.uk/medicine/resources/quality-of-life-questionnaires/dermatology-life-quality-index	Self-reported assessment based on 10 questions measuring impact of disease on quality of life; assesses severity and response to treatment1	Relies on patient willingness and ability to complete
Psoriatic arthritis assessment
Classification for Psoriatic Arthritis Criteria	https://www.mdcalc.com/calc/10039/caspar-criteria-psoriatic-arthritis	Classifies patients with inflammatory musculoskeletal disease as having psoriatic arthritis based on a scoring system, and includes skin findings, nail lesions, dactylitis, negative rheumatoid factor, and juxta-articular bone formation on radiography 30	Used in patients with known inflammatory arthritis
Psoriasis Epidemiological Screening Tool	https://www.psoriasis.org/psoriatic-arthritis-screening-test/	Self-administered to detect psoriatic arthritis	Not validated in children; does not detect axial arthritis or inflammatory back pain40