Skip to content

    Sexual Conditions Health Center

    Bacterial Vaginosis - Exams and Tests

    Your doctor may test you for bacterial vaginosis if you:

    • Have symptoms.
    • Are going to have a hysterectomy or surgical abortion. (Bacterial vaginosis increases infection risk afterwards.)
    • Are pregnant and have symptoms.

    Your doctor can diagnose bacterial vaginosis based on your history of symptoms, a vaginal exam, and a sample of the vaginal discharge. Laboratory tests to detect signs of bacterial vaginosis may include:

    • Wet mount. A sample of vaginal discharge is mixed with a salt (normal saline) solution after placing it on a microscope slide. The prepared slide is examined to identify the bacteria present, to look for white blood cells that point to an infection, and to look for unusual cells called clue cells. The presence of clue cells is one sign f bacterial vaginosis.
    • Whiff test. Several drops of a potassium hydroxide (KOH) solution are added to a sample of vaginal discharge to find out whether a strong fishy odor is produced. A fishy odor on the whiff test suggests bacterial vaginosis.
    • Vaginal pH. The normal vaginal pH is 3.8 to 4.5. Bacterial vaginosis usually causes the vaginal pH to rise above 4.5.
    • Oligonucleotide probes. This test detects the genetic material (DNA) of bacterial vaginosis bacteria. Oligonucleotide probe testing is very accurate but is not routinely available in most labs.

    The presence of clue cells, an increased vaginal pH, and a positive whiff test are enough evidence to treat for bacterial vaginosis.

    Bacterial vaginosis may be found during a routine pelvic exam.

    1

    WebMD Medical Reference from Healthwise

    Last Updated: March 12, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
    Next Article:

    Today on WebMD

    couple kissing
    See pictures and get the facts.
    husband taking prescription painkillers
    13 things that can kill your sex drive.
     
    close up of cold sore
    How to stop them from spreading.
    Condom Quiz
    What are the symptoms?
     

    HIV Myth Facts
    Slideshow
    STD Overview
    Slideshow
     
    Man tearing a condom packet
    Quiz
    things your guy wish you knew slideshow
    Slideshow
     

    Thoughtful man sitting on bed
    Quiz
    Girls Puberty 10
    Quiz
     
    Couple in bed
    Article
    Young couple holding hands
    Quiz