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Lactobacillus IgG Antibody (Serum/Plasma)

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

This test measures the level of antibodies in your blood that your immune system produces in response to certain bacteria in the genus *Lactobacillus*. These antibodies may indicate past exposure to these bacteria.

Quick summary

["This test helps assess immune response to specific gut bacteria."]

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

Key facts at a glance

LOINC
27901-8
Short code
Lactobacillus IgM Ser-aCnc
Synonyms
Lactobacillus IgM Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 Does This Test Measure?

The test detects IgG antibodies against *Lactobacillus*, a group of bacteria commonly found in the gut. IgG antibodies are a type of immune protein your body makes in response to exposure to these bacteria, either through diet, gut microbiome changes, or other factors. This test is often used to evaluate immune reactions or to investigate potential links between gut bacteria and health conditions.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms or conditions that could be related to changes in gut bacteria, such as persistent digestive issues, autoimmune disorders, or unexplained immune responses. It may also be part of research or specialized diagnostic workups.

What Does a Result Mean?

Results are not typically interpreted alone but in the context of your overall health, symptoms, and medical history. Elevated levels might suggest past exposure or immune activity, while lower levels could indicate reduced immune response to these bacteria. Always discuss results with your doctor.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The blood is then sent to a lab for analysis using an immunoassay method to detect IgG antibodies against *Lactobacillus*. This process usually takes a few days to complete.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is primarily used to investigate immune responses related to gut bacteria, potentially aiding in diagnosing or monitoring conditions linked to microbiome changes. It may also be part of research studies or specialized diagnostic protocols, but it is not a standard screening test for most health conditions.

Short name

IgG Antibody to Lactobacillus

Frequently asked questions

What are the typical reasons for ordering this test?
This test is often ordered for research purposes, specialized diagnostic evaluations (e.g., autoimmune conditions, gut-related symptoms), or to assess immune responses to specific bacteria in the gut microbiome. It is not a routine screening test for general health.
How long does it take to get results?
Results typically take several days to a week or more, depending on lab processing times. Your healthcare provider will contact you once results are available.
Can diet or medications affect this test?
Dietary changes or medications that affect gut bacteria (e.g., antibiotics, probiotics) may influence immune responses to *Lactobacillus* and could potentially impact test results. Always inform your doctor about any medications or significant dietary changes before testing.
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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