Vaginal pH testing strips are designed to easily and accurately measure how acidic or alkaline your vagina is on the pH scale. The normal vaginal pH value for a woman of reproductive age ranges from 3.8 to 4.5, but the value may be slightly higher than 4.5 among premenarchal and post-menopausal women. A pH level within this range can help to keep bacterial and fungal infections at bay. A quick and easy way to keep track of your vaginal health.