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Yersinia-specific antibody, IgG class (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 infection by *Yersinia* bacteria, such as those causing gastroenteritis or other illnesses.

Quick summary

["This test helps diagnose or monitor past exposure to *Yersinia* bacteria, often linked to foodborne illnesses."]

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

Key facts at a glance

LOINC
55728-0
Short code
Yersinia sp IgG+IgM Pnl Ser
Synonyms
Yersinia sp IgG+IgM Pnl Ser
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 This Test Measures

The test detects IgG antibodies specific to *Yersinia* organisms. These antibodies indicate your immune system has encountered the bacteria at some point, typically months or years after infection. IgG is a long-lasting antibody that remains in your bloodstream for protection.

Why It’s Ordered

Your healthcare provider may order this test if you’ve had symptoms of a *Yersinia* infection (e.g., diarrhea, fever, abdominal pain) or if you’ve been exposed to contaminated food/water. It can also be used to assess past exposure in certain clinical scenarios.

Sample Collection & Preparation

A blood sample is drawn from a vein in your arm. The blood is processed to separate serum or plasma, which is then tested for IgG antibodies using an immunoassay method. No special preparation is needed, but fasting may not be required.

What to Expect Before the Test

You may experience mild discomfort or bruising at the injection site. Avoid vigorous activity for 1–2 hours afterward. If you’re on blood-thinning medication, inform your provider before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Antibody to Yersinia

Frequently asked questions

What does a positive result mean?
A positive result means your immune system has likely encountered *Yersinia* bacteria before, often months or years ago. It does not confirm an active infection but may support a history of exposure or illness.
Can this test detect an active *Yersinia* infection?
No, this test only detects past exposure via IgG antibodies. For an active infection, your provider may order stool cultures or other diagnostic tests.
Does this test require fasting?
No fasting is required for this blood test. However, follow your provider’s instructions if they recommend any dietary restrictions before your appointment.
  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