Evaluation of the Diagnostic Performance of Colposcopy in the Diagnosis of Histologic Cervical Intraepithelial Neoplasia 2+ (CIN2+)

Background: Colposcopy is a tool for triaging screen positive women regardless of method used for cervical cancer screening. The objective of this study was to evaluate the diagnostic performance of colposcopy in the diagnosis of histologic cervical intraepithelial neoplasia 2+ (CIN 2+) at Jigme Dorji Wangchuck National Referral Hospital (JDWNRH), Thimphu, Bhutan.

Methods: This cross-sectional study was conducted from March 2021 to August 2021 among 299 women who availed colposcopy services at the colposcopy clinic of JDWNRH, Bhutan. Women included in this study were either screen positive (Pap smear) or were suspected to have invasive cancer; they underwent colposcopy and a cervical biopsy irrespective of colposcopy impression. This histopathologic assessment was considered as the gold standard test for the diagnosis of cervical intraepithelial neoplasia (CIN) or invasive cancer.

Results: The mean age of the study participants was 43 years (ranges, 25-76 years). The sensitivity, specificity and accuracy of senior colposcopists to diagnose histologic CIN 2+ were 80.0% (95% CI 59.30, 93.17), 71.07% (95% CI 62.13, 78.95), and 72.60% (95% CI 64.61, 79.65), and for junior colposcopists were 59.46% (95% CI 42.10, 75.25), 76.72% (95% CI 67.97, 84.04), and 72.55% (95% CI 64.76, 79.45) respectively. The overall sensitivity, specificity, and accuracy of colposcopy to diagnose histologic CIN 2+ were 66.67% (95% CI 53.66, 78.05), 73.73% (95% CI 67.63, 79.23), and 72.24% (95% CI 66.79, 77.24) respectively.

Conclusions: In this study, the senior and junior colposcopists had a comparable colposcopic accuracy to diagnose histologic CIN 2+, whereas senior had a higher sensitivity but a lower specificity than junior colposcopists.