Skip to content

Vaginal Lactobacillus Count (Qualitative, Probe-Based Culture)

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

This test checks the presence of beneficial bacteria called *Lactobacillus* in your vaginal fluid, often used to assess vaginal health and balance.

Quick summary

["A healthy vaginal microbiome typically contains a mix of bacteria, but *Lactobacillus* species help maintain acidity and protect against infections."]

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

Key facts at a glance

LOINC
70166-4
Short code
T vaginalis rRNA Cvx Ql NAA+probe
Synonyms
T vaginalis rRNA Cvx Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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

What This Test Measures

The test involves collecting a sample from your vagina using a swab or probe. A microscopic or culture-based method identifies the types and quantities of *Lactobacillus* present, often as a qualitative assessment rather than a precise count.

Why It Matters in Healthcare

High levels of *Lactobacillus* are often associated with a balanced vaginal environment, while low levels may indicate conditions like bacterial vaginosis or other infections. This test helps guide treatment decisions for vaginal health.

Common Uses

Doctors may order this test to diagnose or monitor conditions like bacterial vaginosis, vaginal yeast infections, or to evaluate the effectiveness of treatments targeting vaginal flora.

What to Expect Before the Test

No special preparation is needed, but avoid douching, vaginal medications, or sexual activity 24–48 hours before the test to ensure accurate results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test provides qualitative insight into the vaginal microbiome, helping identify imbalances that may require further evaluation or treatment. While not a definitive diagnostic for infections like bacterial vaginosis, it supports broader assessment of vaginal health and can guide targeted interventions.

Short name

Lactobacillus vaginalis count

Frequently asked questions

Will this test show if I have a yeast infection?
No, this test specifically measures *Lactobacillus* bacteria, not yeast. Yeast infections are typically diagnosed with other tests, such as a microscopic exam of vaginal fluid or a culture.
How long will it take to get my results?
Results are usually available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss the findings with you.
Can I take antibiotics before this test?
Yes, if prescribed by your doctor, but inform your provider beforehand. Antibiotics can temporarily alter vaginal bacteria, so timing may affect 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