Colposcopy Requirement of Papanicolaou Smear after Atypical Squamous Cells of Undetermined Significance (ASC-US) by Follow-up Protocol in an Urban Gynaecology Clinic, a Retrospective Study in Thailand.

Background: ASC-US cases are managed according to the current American Society for Colposcopy and Cervical Pathology (ASCCP) guideline in which a human papillomavirus (HPV) test and repeat Pap smear are performed in the next 1 year. Colposcopy in cases of positive high risk HPV and persistent ASC-US or more in subsequent Pap smear is recommended. The HPV test is more expensive and still not currently a routine practice in Thailand.