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Vaginal pH (qualitative, measured as substance concentration in fluid)

Published: August 9, 2026Updated: August 16, 2026

This test measures the acidity or alkalinity of your vaginal fluids, which can help assess vaginal health or infections.

Quick summary

["Vaginal pH helps identify potential infections or changes in vaginal balance."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
31958-2
Short code
RUBV Ag Vag Ql
Synonyms
RUBV Ag Vag Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order a vaginal pH test to check for signs of infections like bacterial vaginosis, yeast infections, or other conditions affecting vaginal pH levels. It can also be part of routine pelvic exams or after certain treatments.

What to Expect Before the Test

No special preparation is needed. You may be asked to avoid douching or using vaginal products 24 hours before the test to get an accurate reading.

How the Test Is Done

A healthcare provider collects a small sample of vaginal fluid using a swab or cotton-tipped applicator. The sample is then tested in a lab to determine its pH level.

What the Results Mean

A healthy vaginal pH typically ranges between 3.8 and 4.5. Results outside this range may suggest an infection or imbalance in vaginal bacteria.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vaginal pH Test

Frequently asked questions

What causes a change in vaginal pH?
Changes in vaginal pH can occur due to infections (like bacterial vaginosis or yeast infections), hormonal changes (e.g., during menstruation, pregnancy, or menopause), sexual activity, douching, or certain medications.
How long does it take to get results?
Results are usually available within 1 to 2 business days, depending on your lab’s processing time.
Can I take anything to lower my vaginal pH before the test?
No, avoid douching, vaginal creams, or other vaginal products for 24 hours before the test to ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy