Serum/plasma *Escherichia coli* antigen detection by immunoassay (qualitative)
This test checks for the presence of *Escherichia coli* bacteria antigens in your blood or plasma, which may indicate infection or colonization.
["Helps identify possible bacterial infections by detecting specific antigens from *E. coli* in your bloodstream."]
Key facts at a glance
- LOINC
- 93386-1
- Short code
- P aerugns DNA Bld Pos Ql NAA+probe
- Synonyms
- P aerugns DNA Bld Pos Ql NAA+probe
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
This test detects *E. coli* antigens, which are unique proteins produced by the bacteria. If *E. coli* is present in your blood or plasma, these antigens can be found in the sample. The test uses an immunoassay method to identify these antigens qualitatively (yes/no result).
Why It Might Be Ordered
Your healthcare provider may order this test if you have symptoms like fever, chills, or signs of infection, especially if *E. coli* is suspected in a urinary tract infection, bloodstream infection, or other conditions. It can also be used as part of a broader diagnostic evaluation for suspected bacterial infections.
How the Test Works
The test involves collecting a blood or plasma sample. The sample is then analyzed using an immunoassay technique to detect the presence of *E. coli* antigens. This method relies on antibodies that bind specifically to these antigens, allowing for a qualitative result.
What to Expect Before the Test
No special preparation is typically needed for this test. You may be asked to fast for a few hours before the blood draw if it is part of a larger panel, but this is not always required for this specific test alone.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
E. coli Antigen Test (Serum/Plasma)
Frequently asked questions
This test is useful for confirming or ruling out *E. coli* infections in blood or plasma. While it can indicate possible infection, it does not differentiate between different strains or the severity of the infection. Results should be interpreted by a healthcare professional in the context of your symptoms and medical history.
A positive result suggests the presence of *E. coli* antigens in your blood or plasma, which may indicate an infection. However, further testing (such as blood cultures) may be needed to confirm the diagnosis and determine the best treatment.
How long will it take to get the results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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