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Association of clinical properties and compatibility of the Q uanti FERON ‐ TB G old I n‐ T ube test with the tuberculin skin test in patients with psoriasis
Author(s) -
Karataş Toğral Arzu,
Muştu Koryürek Özgül,
Şahin Muzaffer,
Bulut Cemal,
Yağci Server,
Ekşioğlu Hatice Meral
Publication year - 2016
Publication title -
international journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 93
eISSN - 1365-4632
pISSN - 0011-9059
DOI - 10.1111/ijd.12973
Subject(s) - medicine , tuberculin , psoriasis , tuberculosis , latent tuberculosis , psoriasis area and severity index , mycobacterium tuberculosis , immunology , gastroenterology , quantiferon , skin test , pathology
Background Individuals with psoriasis show conflicting responses to the tuberculin skin test ( TST ), a commonly used screening test for latent tuberculosis infection. An alternative to TST is Q uanti FERON ‐ TB G old I n‐ T ube test ( QFT ‐ GIT ), an in vitro interferon‐gamma release assay. This study aimed to determine the effect of the clinical properties of psoriasis (disease severity and koebnerization status) on TST results and the agreement between the TST and QFT ‐ GIT results in psoriatic patients. Methods One hundred patients with mild to severe psoriasis were enrolled in this prospective cross‐sectional study. Psoriasis properties, including disease severity (psoriasis area and severity index score and koebnerization status), latent tuberculosis infection risk factors, and bacillus C almette– G uérin vaccination history, were recorded. All patients underwent a TST and QFT ‐ GIT . TST positivity cut‐off point was ≥10 mm for bacillus C almette– G uérin‐vaccinated patients and ≥5 mm for non‐vaccinated patients. Results Psoriasis area and severity index scores and koebnerization status did not correlate with TST diameters. Only one of the 23 koebnerization‐positive patients developed koebnerization in response to TST . QFT ‐ GIT positivity was prominently higher in the TST ‐positive group, and this was the only factor that differed between the TST ‐positive and TST ‐negative groups ( P < 0.001). Conclusion Tuberculin skin test results were not affected by psoriasis severity or koebnerization status. QFT ‐ GIT positivity was prominently higher in the TST ‐positive group ( P < 0.001). Overall agreement between TST and QFT ‐ GIT results was moderate (κ = 0.413). Concurrent negativity (44%) was higher than concurrent positivity (27%).