Three of four criteria must be met; establishes accurate diagnosis of bacterial vaginosis in 90 percent of affected women.
- Homogeneous vaginal discharge (color and amount may vary)
- Amine (fishy) odor when potassium hydroxide solution is added to vaginal secretions (commonly called the "whiff test")
- Presence of clue cells (greater than 20%) on microscopy*
- Vaginal pH greater than 4.5
* Highly significant criterion.