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Campylobacter IgA Antibody (Serum)

Published: August 9, 2026Updated: August 15, 2026

This test measures the presence of antibodies in your blood that your immune system produces in response to infection by *Campylobacter*, a type of bacteria commonly linked to gastrointestinal illness.

Quick summary

["This test helps identify past or current exposure to *Campylobacter* bacteria."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 15, 2026Editorial policy

Key facts at a glance

LOINC
40616-5
Short code
CAMPYLA
Synonyms
Campylobacter IgA Ser Ql IA
Category
chemistry
Sample
serum
Container
Serum separator tube (SST) or red-top clot activator tube; alternatively, plain red-top tube without anticoagulant
Units
N/A
Ref low
2
Ref high
4
Fasting
false
Population
adult
Sex
all
Age range
≥ 0 years
Method
Enzyme Immunoassay (EIA) or Immunofluorescence Assay (IFA) for qualitative detection of Campylobacter species-specific IgA antibodies in serum
CPT
86625
SNOMED
313310009
Specimen volume
1-2 mL of serum (minimum 0.5 mL)
Stability
Stable at room temperature (15-25°C) for 8 hours; refrigerated at 2-8°C for 7 days; frozen at -20°C or below for up to 30 days. Avoid repeated freeze-thaw cycles.
Hemolysis max
100
Lipemia max
200
Icterus max
50
TAT
24–72 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve had symptoms like diarrhea, stomach cramps, fever, or vomiting that could be caused by a *Campylobacter* infection. It may also be used to confirm a diagnosis in people with suspected foodborne illness or recurrent gastrointestinal issues. Sometimes, it’s part of an investigation into unexplained immune responses or chronic symptoms linked to bacterial exposure.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re concerned about needles or have a bleeding disorder, let your provider know beforehand.

What the Test Results Mean

Positive results indicate your immune system has detected *Campylobacter* antibodies, suggesting past infection or exposure. Negative results mean no detectable antibodies were found in this sample. Results alone don’t confirm active infection; they’re often used alongside clinical symptoms and other tests for diagnosis.

Common Causes of Positive Results

A positive result could be due to a past *Campylobacter* infection, recent exposure (e.g., through contaminated food or water), or rare conditions where the immune system produces antibodies without active infection. It’s important to discuss symptoms and medical history with your provider to interpret results accurately.

Reference range

Negative: No detectable Campylobacter IgA antibodies. Equivocal: Borderline result; retest in 2-4 weeks recommended. Positive: Presence of IgA antibodies suggesting recent or active Campylobacter infection.N/A

Specimen: serum

No special preparation or fasting required. Patients should inform their healthcare provider of any recent antibiotic use, immunosuppression, or gastrointestinal symptoms. Sample should be collected prior to antibiotic therapy initiation when possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Antibody to Campylobacter

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 1 to 3 business days, depending on your lab’s processing schedule. Your healthcare provider will contact you directly with the results.
Can I eat or drink before this blood test?
You can eat and drink normally before the test, as no fasting is required. However, inform your provider if you’re taking any medications that might affect blood tests.
Is this test painful?
The test involves a small needle prick for blood collection, which may cause a brief sting or discomfort. Most people experience minimal pain, and the area may feel sore for a few hours afterward. If you’re anxious about needles, let your provider know about options like numbing cream or distraction techniques.
  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 15, 2026. · Read our editorial policy