We have found 251 cases of abnormal Papanicolou smear using Bethesda System during 2001 and 2002 in Zeynep Kamil Women’s Hospital and retrospectively compared the histology and smears of 91 cases out of 251. Dysplasia is found in atypical squamous cells of undetermined significance favorreactive, atypical squamous cells of undetermined significance-favor dysplastic, low grade squamous intraepithelial lesion and high grade squamous intraepithelial lesions at rates of 2.1 %, 54 %, 55.6 % and 100 % respectively. We discussed the cases in 2002 regarding the addition of atypical squamous cellshigh grade dysplasia not exluded in the Bethesda System. Eliminating the atypical squamous cells of undetermined significance favor-reactive category reduces the ASCUS/LSIL ratio