Yersinia IgG Antibody (Serum) – Immunoassay

What This Test Measures

IgG antibodies are a type of immune protein your body creates after encountering a pathogen (like a bacteria). This test checks for these antibodies to *Yersinia*, a genus of bacteria that can cause gastrointestinal illness. The presence of IgG suggests your immune system has recognized and fought off this bacteria at some point, but it does not indicate whether you currently have an active infection.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you’ve had symptoms like persistent diarrhea, abdominal pain, or fever that could be linked to a bacterial infection. It’s also used in cases of suspected foodborne illness, especially if you’ve eaten contaminated food, or if you’re investigating recurring digestive issues.

What to Expect Before the Test

No special preparation is needed for this test. You’ll typically have a small needle inserted into your arm to draw a blood sample. The process is quick and usually painless. If you’re on blood-thinning medication, let your provider know before the test.

What the Results Mean

A positive result (detecting IgG antibodies) means your body has likely encountered *Yersinia* bacteria in the past. However, this does not confirm an active infection. If you’re experiencing symptoms now, other tests may be needed to identify whether you have an ongoing illness. Results are usually reported as positive or negative, with no specific numeric range provided.