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ORIGINAL RESEARCH |




From the *Division of Research, Department of Obstetrics and Gynecology, Women & Infants Hospital, and the
Center for Statistical Sciences, Brown University, Medical School, Providence, Rhode Island.
Address reprint requests to: Address correspondence to: Robert E. Gutman, MD, 4940 Eastern Avenue, Room 125, Baltimore, MD 21224-2780; e-mail: rgutman1{at}jhmi.edu.
OBJECTIVE: To determine whether the current clinical criteria for diagnosing bacterial vaginosis can be simplified by using 2 clinical criteria rather than the standard 3 of 4 criteria (Amsel's criteria).
METHODS: This was a prospective observational study of 269 women undergoing a vaginal examination in the Women's Primary Care Center, Division of Research, or Colposcopy Clinic at Women & Infants Hospital. All 4 clinical criteria for diagnosing bacterial vaginosis were collected, and Gram stain was used as the gold standard. Sensitivity and specificity were calculated for each individual criterion, combinations of criteria, and a colorimetric pH and amine card. Receiver operating characteristic curve was generated to estimate the preferred pH and percentage of clue cells for diagnosing bacterial vaginosis.
RESULTS: The prevalence of bacterial vaginosis in our study population was 38.7%. Vaginal pH was the most sensitive of all the criteria, at 89%, and a positive amine odor was the individual criteria with the highest specificity, at 93%. Similar specificity was seen with combinations of 2 criteria and Amsel's criteria. Receiver operating characteristic curve analysis yielded a preferred pH and percentage of clue cells of 5.0 and 20%, respectively. However, a pH of 4.5 or greater improves sensitivity with minimal loss of specificity.
CONCLUSION: The clinical criteria for diagnosing bacterial vaginosis can be simplified to 2 clinical criteria without loss of sensitivity and specificity.
LEVEL OF EVIDENCE: II-2
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