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Escherichia coli IgG Antibody, Serum (Quantitative)

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

This test measures the amount of IgG antibodies your body produces in response to exposure to Escherichia coli bacteria. These antibodies help identify past or current immune system reactions to this common gut bacterium.

Quick summary

["This test helps assess immune response to E. coli, often used in diagnosing or monitoring infections or immune-related conditions."]

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

Key facts at a glance

LOINC
26789-8
Short code
E coli IgM Ser-aCnc
Synonyms
E coli 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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, abdominal pain, or if you’ve been exposed to E. coli (e.g., through contaminated food, water, or travel). It may also be used to evaluate immune function in conditions like autoimmune diseases or chronic infections.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is typically done in a lab and results are usually available within a few days.

What the Results Mean

High levels of IgG antibodies suggest your immune system has recognized and responded to E. coli. Low or absent levels may indicate no prior exposure or an impaired immune response. Results are interpreted by your provider based on your medical history and symptoms.

Common Uses and Considerations

This test is often used alongside other diagnostic tools (like stool cultures) to confirm or investigate E. coli infections. It can also help monitor immune conditions or guide treatment decisions in certain chronic illnesses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to E. coli (Serum)

Frequently asked questions

How long does it take to get results from this test?
Results are usually ready within 2–5 business days, depending on lab processing times. Your healthcare provider will discuss them with you during your follow-up visit.
Can I eat or drink before the blood draw?
You can eat and drink normally before your blood draw, as no special diet is required for this test.
Is there any risk or discomfort with this test?
Most people experience only mild discomfort at the injection site, which may include a slight bruise or swelling. Rarely, some may feel lightheaded or experience a small pinch during the draw. Most side effects are temporary.
  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