In order to evaluate the accuracy of colposcopically directed biopsy in the diagnosis of Cervical Intraepithelial Neoplasia (CIN), in a series of 164 patients we compared findings from histological serial section of colposcopically directed biopsy with those from histological serial section of the entire lesion after diathermic loop excision. Colposcopically directed biopsy allowed a correct diagnosis to be made in 73 to 76.3% of cases, depending on the importance of the cervical lesion.
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