1997 Volume 36 Issue 2 Pages 136-140
We retrospectively rescreened cases diagnosed as false negatives on the first screening, in order to clarify the accuracy of cytology in our department. Of 44, 962 cases negative on the first screening, 133 were judged as suspicious or positive on the second screening. The false negative rate was 0.29%. Among false negative factors, screening on Monday, samples of urine, pleural and peritoneal fluid and bile, screening experience less than three years, a small number of atypical cells on a preparation and an inflammatory or degenerative smear were associated with high false negative rates. In order to reduce misevaluation in screening, we must be aware of the above results and promote the double screening system.
