Four criteria can be used to diagnose vaginitis

1. Vaginal discharge is grayish white, very sticky, even like paste, and uniform, but it is not purulent, and the amount is variable.

2. The secretion has a particularly high amine content, so it has a fishy smell. During sexual intercourse or after activity, the smell is often aggravated due to the release of amines. Adding 10% potassium hydroxide to the secretion can also release the amine smell.

3. The pH value in vaginal secretions increases, with a pH range of 5.0 to 5.5, while the normal pH is 3.7 to 4.5.

4. Clue cells can be detected in wet smears of vaginal secretions.

Among the above four criteria, the diagnosis can be confirmed if three or more are met, and the fourth is emphasized as a necessary diagnostic criterion.