You should do this test to help evaluate if your vaginal symptoms (i.e., itching, burning, unpleasant odor, or unusual discharge) are likely caused by an infection that needs medical treatment. The test is not intended for HIV, chlamydia, herpes, gonorrhea, syphilis, or group B streptococcus.

Abnormal vaginal pH may be higher or lower than normal vaginal pH. High vaginal pH numbers indicate less acidity, while lower than normal vaginal pH levels indicate high acidity.
Abnormal vaginal pH frequently indicates the presence of a vaginal infection. However, you should know that not all vaginal infections cause changes to vaginal pH.
This means that having a normal vaginal pH test does not necessarily mean that you do not have a vaginal infection. If your vaginal pH is above normal, the most likely reason is that you have bacterial vaginosis (BV) and not a yeast infection. In this case, don't use OTC medications for vaginal yeast infections, because the medication will not treat your BV. Instead, you'll need to see your doctor for diagnosis and treatment.
On the other hand, if your vaginal pH is normal or below normal and you've had previous vaginal yeast infections diagnosed by a doctor, you can try one of the OTC medications for vaginal yeast infections. If this does not cure your vaginal symptoms or infection, see your doctor for the appropriate diagnosis and treatment. salt-losing nephropathy (Bartter syndrome)