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Antibody Detection by Line Blot (e.g., for *E. coli* O157:H7 or other pathogens)

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

This test detects antibodies in your blood that may indicate exposure to certain harmful bacteria or viruses, often used to confirm infections like *E. coli* or other foodborne illnesses.

Quick summary

["Helps identify past exposure to specific pathogens through antibody detection."]

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

Key facts at a glance

LOINC
89533-4
Short code
ENA Scl70 Ab CSF Ql Line blot
Synonyms
ENA Scl70 Ab CSF Ql Line blot
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
line-blot
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test uses a line blot method to detect specific antibodies in your serum or plasma. These antibodies are your immune system’s response to exposure to particular pathogens (e.g., bacteria, viruses). The presence of these antibodies suggests your body has encountered the pathogen before, often through infection.

How the Test Works

A small sample of your blood is drawn and tested. The sample is exposed to known pathogen antigens (e.g., bacterial proteins) on a specialized blot. If antibodies bind to these antigens, they form visible lines, indicating a positive result.

Common Uses

This test is typically used for diagnosing or confirming infections where antibody detection is helpful, such as foodborne illnesses, certain bacterial infections, or research settings where specific pathogen exposure is suspected.

Preparation for the Test

No special preparation is needed. You may eat, drink, or take medications as usual on the day of your test. Bring any medications or medical devices you use to your appointment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Pathogen Line Blot Antibody Test

Frequently asked questions

Why might this test be ordered?
Your healthcare provider may order this test if you have symptoms of infection (e.g., fever, diarrhea, abdominal pain) or if you’ve had exposure to a known pathogen. Antibody detection can help confirm a diagnosis, especially when other tests are inconclusive or when past exposure is suspected.
What does a positive result mean?
A positive result means your blood contains antibodies specific to the tested pathogen, suggesting you’ve likely been exposed to it at some point. This does not necessarily mean you are currently infected but may indicate past exposure.
What does a negative result mean?
A negative result means your blood did not detect the specific antibodies for the tested pathogen. This could mean you have not been exposed to the pathogen or that your immune response has not yet developed detectable antibodies.
  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