Psoriatic Arthritis Screening Test
One in three individuals with psoriasis have psoriatic arthritis. 
Psoriatic arthritis (PsA) is a common comorbidity of psoriasis. PsA can lead to permanent damage to bones and joints, especially if untreated. Currently, no diagnostic test for PsA exists. Thankfully, validated screening tools exist to help identify signs and symptoms of the disease..
The Psoriasis Epidemiology Screening Tool (PEST) is a validated screening tool for psoriatic arthritis . It is recommended that individuals with psoriasis complete the PEST screener every six months. Forty-one percent of those who screened positive for PsA using the PEST had not previously been diagnosed with PsA.
Take the Psoriasis Epidemiology Screening Tool (PEST)
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2. Ibrahim GH, Buch MH, Lawson C, Waxman R, Helliwell PS. Evaluation of an existing screening tool for psoriatic arthritis in people with psoriasis and the development of a new instrument: the Psoriasis Epidemiology Screening Tool (PEST) questionnaire. Clin Exp Rheumatol. 2009;27(3):469-74. Epub 2009/07/17. PubMed PMID: 19604440.