Vaginal Wet Mount

A vaginal wet mount (sometimes called a vaginal smear) is a test to find the cause of vaginitis, or inflammation of the vagina and the area around the vagina (vulva). See a picture of Reference female genitalia Opens New Window Reference Opens New Window.

Vaginitis is often caused by an infection, but it may also be caused by a reaction to vaginal products such as soap, bath oils, spermicidal jelly, or douches. Vaginitis may cause symptoms such as vaginal itching, pain, or discharge.

Infections that can cause vaginitis are common and include:

• Yeast infection. A vaginal yeast infection is caused by a type of yeast called Candida albicans. A yeast infection is also called a candida infection, or candidiasis. A vaginal yeast infection often causes itching and a white, lumpy discharge that looks like cottage cheese. It also causes pain with sexual intercourse. A yeast infection is not a Reference sexually transmitted infection (STI) Opens New Window.
• Trichomoniasis. Trichomoniasis is an infection caused by a Reference parasite Opens New Window (Trichomonas vaginalis). It is sometimes called trichomonas infection, trichomonal infection, or simply trich (say "trick"). Trichomoniasis causes a vaginal discharge that is yellow-green, foamy, and bad-smelling. Pain with sex or urination may be present. Lower belly pain may also be present. Trichomoniasis is spread by sexual contact and is an STI.
• Bacterial vaginosis. Bacterial vaginosis is a change in the balance of bacteria that are normally present in the vagina. The vaginal discharge is thin and milky with a strong fishy odor. Many women have no symptoms. Bacterial vaginosis is not an STI.
• Other sexually transmitted infections (STIs). Infections such as Reference chlamydia Opens New Window, Reference genital warts Opens New Window, Reference syphilis Opens New Window, Reference herpes simplex Opens New Window, and Reference gonorrhea Opens New Window can also affect the vagina. These infections are found by doing other tests.

A vaginal sample may be tested by:

• Wet mount. A sample of the vaginal discharge is placed on a glass slide and mixed with a salt solution. The slide is looked at under a microscope for bacteria, yeast cells, trichomoniasis (trichomonads), white blood cells that show an infection, or Reference clue cells Opens New Window that show bacterial vaginosis.
• KOH slide. A sample of the vaginal discharge is placed on a slide and mixed with a solution of potassium hydroxide (KOH). The KOH kills bacteria and cells from the vagina, leaving only yeast for a yeast infection.
• Vaginal pH. The normal vaginal Reference pH Opens New Window is 3.8 to 4.5. Bacterial vaginosis, trichomoniasis, and Reference atrophic vaginitis Opens New Window often cause a vaginal pH higher than 4.5.
• Whiff test. Several drops of a potassium hydroxide (KOH) solution are added to a sample of the vaginal discharge. A strong fishy odor from the mix means bacterial vaginosis is present.

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