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Yersinia IgA Antibody (Serum)

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

This test measures the level of Immunoglobulin A (IgA) antibodies in your blood that your immune system produces in response to infection by *Yersinia* bacteria, such as those causing gastroenteritis or other infections.

Quick summary

["It helps assess past exposure to *Yersinia* bacteria and may support diagnosis or monitoring of related infections."]

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

Key facts at a glance

LOINC
17775-8
Short code
Yersinia IgA Ser-aCnc
Synonyms
Yersinia IgA 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 Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like diarrhea, abdominal pain, fever, or other signs of infection that *Yersinia* bacteria could cause. It may also be used in research or specialized diagnostic settings to investigate suspected *Yersinia* exposure, particularly in immunocompromised individuals or those with recurrent infections.

What Does a Positive Result Mean?

A positive result indicates your immune system has detected and produced IgA antibodies against *Yersinia* bacteria, suggesting past infection or exposure. This does not necessarily mean you currently have an active infection but may help confirm a diagnosis or guide further testing.

What Does a Negative Result Mean?

A negative result means your blood did not contain detectable IgA antibodies against *Yersinia* at the time of testing. This could mean you have never been exposed, or the infection may have resolved before testing. However, timing of testing and antibody persistence can vary.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The serum (liquid part of blood without clots) is then tested using an immunoassay method to detect IgA antibodies specific to *Yersinia* bacteria. The test is typically performed in a laboratory.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Antibody to Yersinia

Frequently asked questions

Is this test useful for diagnosing *Yersinia* infections in real-time?
While IgA antibodies can indicate past exposure, they are not typically used alone to diagnose an active *Yersinia* infection. Your healthcare provider may rely on clinical symptoms, other lab tests (such as culture results), or imaging studies instead. This test is more commonly used in research, specialized diagnostic contexts, or to evaluate immune response in specific populations.
Can this test help determine if I’ve had a *Yersinia* infection in the past?
Yes, this test can provide evidence of past *Yersinia* exposure by detecting IgA antibodies. However, antibody levels may decline over time, so results should be interpreted in the context of your medical history and symptoms. Consult your provider for guidance.
Are there any risks or side effects from this blood test?
The most common side effect is mild bruising, redness, or soreness at the injection site. Rarely, there may be a slight reaction to the needle. Most people experience no serious complications from this procedure.
  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