Multidimensional slit‐scan prescreening system: Preliminary results of a single blind clinical study

A multidimensional slit‐scan flow system was developed to serve as an automated prescreening instrument for gynecological cytology. A 2‐year single blind clinical study was carried out to evaluate system performance. Cellular material was collected by scraping the uterine cervix and stained in suspension with acridine orange. Seven hundred and forty specimens (701 patients) including 156 abnormal specimens representing a broad spectrum of abnormality were analyzed. Approximately 50,000 cells were analyzed for each specimen. The system false‐positive rate was 17.6% while the false‐negative rate was 2.8%. All misclassified abnormals were specimens with cellular changes consistent with a slight dysplasia of nonkeratinizing type. The instrument in its present configuration appeared sensitive to the entire spectrum of abnormality existing in the female genital tract and it classified as abnormal any specimen containing on the order of 0.1% (or greater) abnormal cells.