International Journal of Health Sciences and Research

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Original Research Article

Year: 2019 | Month: April | Volume: 9 | Issue: 4 | Pages: 27-30

Diagnostic Efficacy of Wood’s Lamp Examination Compared with Koh Wet Mount for Diagnosis of Pityriasis Versicolor Cases

Remya V. S1, Arun B2

1Assistant Professor, Department of Microbiology, Pariyaram Medical College, Kannur, Kerala, India.
2Assistant Professor, School of Health Sciences, Kannur University, Kannur, Kerala

Corresponding Author: Arun B


Background: Pityriasis versicolor (PV) is a chronic superficial fungal infection prevalent in tropical and subtropical countries. KOH wet mount and Wood’s lamp examination are useful in diagnosing pityriasis versicolor. Aim of the study is to compare the effectiveness of Wood’s lamp examination in clinically suspected pityriasis versicolor cases compared with KOH wet mount.
Objective: To demonstrate the diagnostic efficacy of Wood’s lamp examination in comparison with KOH wet mount for diagnosis of PV. Methods: A total number of 450 different body sites of 422 pityriasis versicolor cases with respect to colour of lesions were studied. Wood’s lamp examination was done in a dark room using Wood’s lamp and 10% KOH wet mount was performed with Skin scrapings. Statistical analysis was done.
Result: Out of 450 lesions sampled, Wood’s lamp was positive with 388 (86.2%). KOH wet mount gave 402 (89.3%) positive results. The sensitivity and specificity of Wood’s lamp examination when compared with KOH wet mount was 96.52%, 100% respectively.
Conclusion: The diagnostic efficacy of Wood’s lamp is comparable to KOH wet mount.

Key words: Pityriasis versicolor, Malassezia, KOH wet mount, Wood’s lamp

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