Skip to content

Escherichia coli Antigen (Serum) – 24-Hour Urine Collection Screening

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

This test checks for the presence of *Escherichia coli* bacteria in your urine over a 24-hour period, often used to evaluate urinary tract infections or contamination sources.

Quick summary

["A 24-hour urine test for *E. coli* helps identify possible infection or contamination in your urinary system."]

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

Key facts at a glance

LOINC
105071-5
Short code
E coli SXT1+2 Stl
Synonyms
E coli SXT1+2 Stl
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like frequent urination, pain, fever, or unexplained urinary tract issues. It may also be used to confirm infection, assess contamination risks (e.g., from hygiene practices), or monitor treatment effectiveness.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours, typically starting after midnight. Store samples in a cool, sealed container. Follow your provider’s instructions precisely to ensure accurate results.

How the Test Works

A lab analyzes urine samples for *E. coli* bacteria, which may be detected through culture, immunoassay, or other methods. The test screens for bacterial presence rather than measuring specific markers.

Common Causes of Positive Results

Positive results may indicate a urinary tract infection, fecal contamination (e.g., from poor hygiene), or other conditions affecting urine composition. False positives can occur if hygiene practices are inadequate.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

E. coli Urine Screening (24h)

Frequently asked questions

Is this test painful or uncomfortable?
No, this test involves collecting urine over 24 hours—no invasive procedures are needed. You’ll need to follow collection guidelines carefully to avoid errors.
How soon will I get results?
Results typically take 1–3 business days, depending on lab processing. Your provider will discuss findings with you during your follow-up visit.
Can I drink alcohol or certain foods before testing?
Avoid alcohol or strongly flavored foods for 24 hours before testing to reduce potential interference. Stick to plain water unless instructed otherwise.
  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