Free tool
Vaginal pH Reader
A healthy vagina is usually acidic, with a pH of 4.5 or below. A home strip reading above 4.5 can happen with bacterial vaginosis, but also after sex, during a period or with other causes, so a number alone cannot say why. Use this reader to understand a reading, then talk to a clinician.
How to use it
- Use a home vaginal pH strip as its instructions describe and match the color to its chart.
- Pick the number from your strip (3.5 to 7.0).
- Read what that range generally means and the common reasons it can shift.
- If your reading is above 4.5 and you have symptoms, or you are pregnant, contact a clinician.
Reference
| Reading | What it generally means | Suggested next step |
|---|---|---|
| 3.5 to 4.5 | Within the usual acidic range for people who have not reached menopause. | No action needed for the number alone. See a clinician if you have symptoms. |
| 4.6 to 5.0 | Above the usual range. Can follow sex, a period, or douching; it is also one sign clinicians check for BV. | Retest on a different day away from sex and your period. See a clinician if you have symptoms or it stays raised. |
| Above 5.0 | Clearly above the usual range. Has several possible causes, including after menopause. | Contact a clinician, especially with discharge, odor, itching, or pregnancy. |
What healthy looks like
In a study of 56 healthy women whose vaginal bacteria were mostly lactobacilli, measured vaginal pH averaged about 3.5 (range 2.8 to 4.2).
What can shift a reading
Semen, menstrual blood, douching and recent use of vaginal products can all raise a reading temporarily. Test when none of these apply.
After menopause
Lower estrogen after menopause can raise vaginal pH. In one study of 45 women, most postmenopausal women not on hormone therapy did not have lactobacillus-dominated flora, so a higher reading means something different at that life stage.
A number is not a diagnosis
pH is one clue among several. Yeast infections often show a normal pH, and a raised pH has more than one cause.
How this tool works
The reader compares your number with one threshold used in CDC clinical guidance: vaginal fluid pH above 4.5 is one of several signs clinicians look at for bacterial vaginosis. It does not diagnose anything; a raised reading has several possible causes. The reader runs only in your browser and nothing is sent or stored.
Frequently asked questions
What is a normal vaginal pH?
Before menopause, vaginal pH is usually 4.5 or below. CDC guidance uses a pH above 4.5 as one of several signs clinicians check for bacterial vaginosis.
Does a high pH mean I have BV?
Not on its own. Sex, your period, douching and menopause can all raise pH. A clinician uses pH together with an exam and other tests.
Can a pH strip detect a yeast infection?
Usually not. Yeast infections often occur with a vaginal pH in the normal range, so a normal reading does not rule one out. A clinician can test vaginal fluid if you have symptoms.
When is the best time to test?
Follow your strip's instructions, and avoid testing during your period, soon after sex, or after using vaginal products, since these can shift the reading. Retest on another day if a reading surprises you.
Is anything I enter stored?
No. The reader runs entirely in your browser. Your number is not sent anywhere, not saved on your device and not added to analytics, and nothing appears in the page address.
Should I test during pregnancy?
If you are pregnant and have vaginal symptoms, contact your clinician rather than relying on a home strip. Symptoms in pregnancy need a clinician's assessment, and a strip cannot tell you the cause.
Sources
- CDC: Bacterial Vaginosis, STI Treatment Guidelines (pH above 4.5 criterion)
- CDC: Vulvovaginal Candidiasis, STI Treatment Guidelines
- ACOG: Vaginitis
- O'Hanlon et al., 2013, Vaginal pH and microbicidal lactic acid when lactobacilli dominate the microbiota (PubMed 24223212)
- Gliniewicz et al., 2019, Comparison of the Vaginal Microbiomes of Premenopausal and Postmenopausal Women (PubMed 30837959)
This tool gives general information for adults and does not diagnose or treat any condition. It is not a substitute for advice from a clinician. If you have severe symptoms, fever, or are pregnant, contact a healthcare professional.