Which examination finding is characteristic of bacterial vaginosis?

Which examination finding is characteristic of bacterial vaginosis?

• A. Clue cells on microscopy
• B. Positive whiff test
• C. Vaginal pH > 4.5
• D. Normal vaginal flora with acidic pH

Answer: (C)

Bacterial vaginosis causes a shift in vaginal flora from lactobacilli to anaerobic bacteria, which reduces the production of lactic acid and raises the vaginal pH. A vaginal pH greater than 4.5 is a classic, objective finding and is part of the diagnostic criteria used for BV. This alkaline shift reflects the loss of the normally acidic vaginal environment maintained by lactobacilli and helps distinguish BV from other conditions. While clue cells on microscopy and a positive whiff test are also common BV findings, the elevated pH is the most characteristic exam finding that points toward BV. The option describing normal vaginal flora with an acidic pH does not fit BV, since BV involves dysbiosis with a higher, not lower, pH.

Bacterial vaginosis causes a shift in vaginal flora from lactobacilli to anaerobic bacteria, which reduces the production of lactic acid and raises the vaginal pH. A vaginal pH greater than 4.5 is a classic, objective finding and is part of the diagnostic criteria used for BV. This alkaline shift reflects the loss of the normally acidic vaginal environment maintained by lactobacilli and helps distinguish BV from other conditions. While clue cells on microscopy and a positive whiff test are also common BV findings, the elevated pH is the most characteristic exam finding that points toward BV. The option describing normal vaginal flora with an acidic pH does not fit BV, since BV involves dysbiosis with a higher, not lower, pH.