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Abnormal vaginal pH and Mycoplasma genitalium infection

Jill S Huppert1, Justin R Bates, Akilah F Weber

  • 1Division of Pediatric and Adolescent Gynecology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229-3039, USA. jill.huppert@cchmc.org

Journal of Pediatric and Adolescent Gynecology
|November 20, 2012
PubMed
Abstract

Insights

Vaginal pH may help predict Mycoplasma genitalium (MG) infection in adolescent women when standard tests are unavailable. Elevated pH (over 4.5) is a key indicator for suspecting MG, particularly if bacterial vaginosis (BV) and Trichomonas vaginalis (TV) are absent.

Area of Science:

  • Reproductive Health
  • Infectious Diseases
  • Microbiology

Background:

  • Mycoplasma genitalium (MG) is a significant sexually transmitted pathogen contributing to female morbidity.
  • Current diagnostic methods for MG are not standardized, posing challenges in clinical settings.
  • Point-of-care (POC) testing offers a potential solution for rapid detection of STIs.

Purpose of the Study:

  • To evaluate the predictive value of various vaginal point-of-care (POC) tests for Mycoplasma genitalium (MG) infection.
  • To identify accessible indicators for suspecting MG in adolescent women.

Main Methods:

  • A cross-sectional study involved 217 sexually active adolescent women (aged 14-22).
  • Vaginal swabs underwent POC testing for pH, amines, clue cells, sialidase, and Trichomonas vaginalis (TV).
  • Mycoplasma genitalium (MG), Chlamydia trachomatis (CT), and Neisseria gonorrhoeae (NG) were detected using transcription-mediated amplification (TMA) assays.

Main Results:

  • Mycoplasma genitalium (MG) was detected in 14% of participants.
  • Elevated vaginal pH (>4.5) was identified as a significant predictor of MG infection (OR 4.4, P < .05).
  • In women without clinical BV or TV, a pH > 4.5 was associated with a higher prevalence of MG (25% vs 9%, P = .02).

Conclusions:

  • Vaginal pH > 4.5 may serve as a useful indicator for suspecting Mycoplasma genitalium (MG) infection.
  • This pH-based suspicion is particularly relevant in the absence of bacterial vaginosis (BV) and Trichomonas vaginalis (TV).
  • Further research is needed to develop standardized, approved diagnostic tests for MG.

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