How can you diagnose bacterial vaginosis?

By a check up: Bacterial vaginosis is one of the common vaginal infections women get. Symptoms include vaginal irritation, a grey discharge and a fishy odor. The ways to diagnose this includes a wet mount - looking at the discharge under a microscope, checking the ph and checking for odor when KOH is added. Another test is a dna test and a third way is by culture. These are done during an exam.