Quality control of Papanicolaou tests

Abstract

The Papanicolaou test, or oncotic cytology, is a screening test used to detect precancerous lesions in the cervix. Its accuracy depends on variables such as sample collection, fixation, staining, and smear reading. The collection and fixation are the responsibility of the professional performing the test, while staining and smear reading are the laboratory's responsibility. Since reading is subjective, quality control is critical. Internal practices include cytologic-histologic correlation, review by experienced professionals, and retrospective re-evaluation of high-grade lesions. External quality control is conducted by specialized associations or services accredited by the Ministry of Health, through rechecks and online evaluations. In addition to quality control, ongoing education is essential to maintain the test's accuracy. The quality of the Papanicolaou test relies on proper collection, correct analysis, and an adequate laboratory setup. Successful screening also requires an organized follow-up after the cytological diagnosis.