30th April 2024

A 25-year-old woman presents with a three-day history of increased vaginal discharge that is thin, grey, and has a fishy odour.

A 25-year-old woman presents with a three-day history of increased vaginal discharge that is thin, grey, and has a fishy odour. She denies any pain, itching, or burning sensation. She is not currently menstruating and has no history of similar symptoms. There has been no recent change in sexual partners or contraceptive methods.

Which is the most appropriate initial diagnostic investigation for bacterial vaginosis in this patient?