Reliability of self-collected versus provider-collected vaginal swabs for the diagnosis of bacterial vaginosis

Women reluctant to undergo a per-speculum examination consider self-sampling more acceptable. The aim of this study was to compare self-collected vaginal swabs for detection of bacterial vaginosis (BV), candidiasis and trichomoniasis, with vaginal specimens obtained by the gynaecologist at per-speculum examination. Self-collected and provider-collected vaginal swabs were obtained from 50 women attending the gynaecological outpatients department. The Gram-stained smears and saline wet mounts prepared from the provider-collected vaginal swabs were examined by a microbiologist and a gynaecologist. We determined the validity and the inter-rater reliability of the overall BV score and the morphotype specific score using Kappa statistics. When compared with the provider-collected smear, the ability of the self-collected smear to diagnose BV had a sensitivity of 70% and a specificity of 97%. With specific instructions to help assure the depth of sampling, self-collected swabs can reasonably approximate specimens obtained by clinicians during speculum examination for the diagnosis of BV.