OBJECTIVE: This study evaluates the effectiveness of endocervical curettage (ECC) in detecting additional high-grade squamous intraepithelial lesions or worse (HSIL+) in women infected with human papillomavirus (HPV) types 16 and 18, which may be missed by biopsy alone. METHODS: A retrospective cohort study analyzed the medical records of 4,811 women referred for colposcopy due to HPV16/18 infection from January 2019 to December 2023. Patients underwent both biopsy and ECC. Statistical comparisons of various clinical factors between HSIL+ and low-grade or normal lesions were performed using χ 2 tests and logistic regression analyses, with stratified analysis to determine ECC's additional detection rate under different clinical conditions. RESULTS: Endocervical curettage detected an additional 6.46% of HSIL+ lesions missed by biopsy alone, with the highest rates in women with normal colposcopic impressions (23.1%), those aged 50 or older (12%), type 3 transformation zones (9.5%), and postmenopausal women (11.9%). In contrast, younger women under 30 and those with type 1 or 2 transformation zones had significantly lower detection rates (2.9%). Logistic regression indicated that older age, type 3 transformation zone, higher grade cytological results, and abnormal colposcopic impressions are significant risk factors for HSIL+ detection via ECC ( p <
.001). CONCLUSIONS: Data from this study indicate that ECC would be beneficial for women over 30 with HPV16/18 infections, particularly those with type 3 transformation zones or normal colposcopy, as it enhances HSIL+ detection. However, it offers minimal benefit for younger women or those with type 1 or 2 transformation zones.