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Yersinia antibody serologic test (qualitative, serum/plasma)

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

This test checks for antibodies to *Yersinia* bacteria, which can cause infections like gastroenteritis or septicemia. Antibodies indicate past or current exposure.

Quick summary

["This test helps determine if you’ve been exposed to *Yersinia* bacteria."]

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

Key facts at a glance

LOINC
40931-8
Short code
Yersinia Ab Ser Ql
Synonyms
Yersinia Ab Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 the presence of antibodies against *Yersinia* species in your blood. Antibodies are proteins your immune system produces in response to infection. If you have these antibodies, it suggests you’ve either had an infection or been exposed to the bacteria.

Why It’s Ordered

Your healthcare provider may order this test if you have symptoms like fever, diarrhea, abdominal pain, or a history of travel to areas with known *Yersinia* outbreaks. It can also be used for diagnostic confirmation in suspected cases.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw from a vein in your arm. If you’re taking blood thinners, inform your provider beforehand.

What the Results Mean

A positive result means you likely had an infection or exposure. A negative result means no detectable antibodies were found at this time, but it doesn’t rule out past exposure. Follow-up testing or clinical correlation may be needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Yersinia Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result indicates your immune system has recognized *Yersinia* bacteria, suggesting past infection or exposure. It doesn’t always mean you’re currently sick, but it confirms exposure history.
Can this test detect current infection?
This test primarily detects past exposure through antibodies. For active infections, other diagnostic methods (like culture or clinical symptoms) are typically used.
Do I need to repeat this test if I have symptoms again?
Yes, if you develop new symptoms, repeat testing may be advised. Antibody levels can change, and a second test could clarify if reinfection or a different cause is present.
  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