Cervical cytology: a randomized comparison of four sampling methods.

Abstract

OBJECTIVE: The purpose of this study was to compare smear quality and endocervical cell recovery of four cervical smear sampling devices. STUDY DESIGN: Two thousand fifteen patients undergoing routine cervical smears at the University of Tennessee Obstetrics and Gynecology clinics were randomly assigned to a cotton swab-spatula, Cytobrush-spatula, Cervex-Brush, or Bayne Pap Brush. The cytopathology laboratory, blind to method, used specific criteria to grade smears as being optimal, adequate, marginal, or inadequate. Statistical analysis was by the chi 2 and analysis of variance tests. RESULTS: No statistical differences occurred among the groups for nonpregnant patients. For pregnant patients smear quality was improved with both Cytobrush-spatula and Bayne Pap Brush versus cotton swab-spatula (p = 0.0301 and 0.0004, respectively); cotton swab-spatula had fewer endocervical cells than the Cytobrush-spatula (p = 0.0001), Cervex-Brush (p = 0.0288), and Bayne Pap Brush (p = 0.0081). CONCLUSIONS: The cotton swab-spatula and Cytobrush-spatula appear to be the most effective screening methods for nonpregnant and pregnant patients, respectively.