Diagnostic Approach and Treatment of Vaginal Itching and Burning

Diagnostic Criteria

A vaginal pH of ≤4.5 suggests vulvovaginal candidiasis, while a pH >4.5 indicates bacterial vaginosis or trichomoniasis, as measured using narrow-range pH paper directly applied to vaginal secretions 1, 2
The presence of clue cells in a saline wet mount is indicative of bacterial vaginosis 1, 2
Motile trichomonads in a saline wet mount confirm trichomoniasis 1, 2
A positive whiff test, characterized by a fishy odor after KOH application, supports the diagnosis of bacterial vaginosis or trichomoniasis 1

The American College of Obstetricians and Gynecologists recommends metronidazole 500 mg orally twice daily for 7 days as the first-line treatment for bacterial vaginosis, with a 95% cure rate 1
For vulvovaginal candidiasis, fluconazole 150 mg orally as a single dose is recommended, with a 55% therapeutic cure rate 1
Metronidazole 2 grams orally as a single dose is the recommended treatment for trichomoniasis, with a 90-95% cure rate 1
Sexual partners of patients with trichomoniasis must be treated simultaneously to prevent reinfection 1
The Centers for Disease Control and Prevention advises against treating partners for bacterial vaginosis or candidiasis, except in cases of trichomoniasis 1

The American College of Obstetricians and Gynecologists recommends that HIV-infected women receive identical treatment regimens as non-HIV-infected women for all three conditions 1
Pregnant women should only receive 7-day topical treatments for bacterial vaginosis and candidiasis 1
Seminal fluid hypersensitivity can cause symptoms within seconds to minutes after ejaculation and can be prevented by condom use, as reported by the Journal of Allergy and Clinical Immunology 3