What is the role of a vaginal pH test in the workup of vaginitis?

Updated: Dec 04, 2018
  • Author: Hetal B Gor, MD, FACOG; Chief Editor: Michel E Rivlin, MD  more...
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Vaginal pH can be determined with litmus paper. A pH greater than 4.5 is often found in patients with Trichomonas infection or bacterial vaginosis (84-97% sensitivity, 57-78% specificity). Recent intercourse, douching, cervical mucus, and blood can lead to false-positive results.

  • Bacterial vaginosis - pH is 5.0-6.0

  • Vaginal candidiasis - pH is less than 4.5

  • T vaginalis infection - pH is 5.0-7.0

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