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Lactobacillus DNA Detection by Nucleic Acid Amplification Probe (Qualitative)

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

This test checks for the presence of genetic material from *Lactobacillus* bacteria, a common group of gut microbes that may support digestive health. It uses a probe to detect DNA in a sample, often ordered to assess gut microbiome composition or infection.

Quick summary

["This test helps determine if specific *Lactobacillus* bacteria are present in your sample, which can inform gut health or infection evaluation."]

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

Key facts at a glance

LOINC
92781-4
Short code
Lactobacillus DNA Bld Pos Ql NAA+probe
Synonyms
Lactobacillus DNA Bld Pos Ql NAA+probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, gut discomfort, or if they suspect an imbalance in gut bacteria (dysbiosis). It could also be used to monitor conditions like bacterial overgrowth or infections involving *Lactobacillus*-like organisms.

How the Test Works

The test analyzes a sample (likely stool) for genetic material from *Lactobacillus* bacteria. A specialized probe targets specific DNA sequences unique to these microbes, and amplification confirms their presence. This is a qualitative (yes/no) result, not a measurement of quantity.

Sample Collection and Preparation

You’ll provide a stool sample, which is sent to the lab for processing. The lab extracts DNA from the sample and applies the amplification probe to detect *Lactobacillus* DNA. No special preparation is needed beyond collecting the sample as directed by your provider.

What the Results Mean

A positive result indicates the presence of *Lactobacillus* DNA in your sample. A negative result means no detectable DNA from these bacteria. Results are qualitative and do not provide exact counts or concentrations of bacteria.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lactobacillus DNA Test

Frequently asked questions

What does a positive result mean?
A positive result suggests that *Lactobacillus* DNA is present in your sample. This may indicate normal gut flora, an overgrowth of these bacteria, or other conditions affecting your microbiome. Your healthcare provider will discuss the next steps based on your clinical picture.
Can this test detect all types of *Lactobacillus* bacteria?
This test detects *Lactobacillus* DNA broadly, but it may not distinguish between different species or strains. It focuses on the genetic material common to this group of bacteria, so results may not be specific to a particular type.
How long does it take to get results?
Results are typically available within 24 to 72 hours, depending on lab processing times. Your healthcare provider will contact you once the results are ready.
  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