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Escherichia coli (E. coli) quantitative culture from a specified specimen

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

This test helps detect and measure how many *Escherichia coli* bacteria are present in your sample, such as urine or blood.

Quick summary

["A positive culture can help diagnose infections caused by E. coli, guiding treatment decisions."]

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

Key facts at a glance

LOINC
86322-5
Short code
EV Spec Ql Cult
Synonyms
EV Spec Ql Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is This Test Measuring?

This test counts the number of *E. coli* bacteria in your sample, typically expressed as colony-forming units (CFUs) per milliliter or per gram, depending on the specimen type. It’s not a specific test for a single strain but identifies the presence of the bacterium.

Why Might You Need This Test?

You may need this test if you have symptoms like urinary tract infection (UTI) symptoms, bloodstream infection signs, or other signs of bacterial infection where *E. coli* is a common culprit.

How Is the Sample Collected?

A sterile sample (e.g., urine, blood, or other bodily fluid) is collected and sent to the lab. The lab then grows the bacteria in a controlled environment to count them accurately.

What Does a Positive Result Mean?

A positive result indicates the presence of *E. coli* bacteria in your sample. The exact count helps determine the severity and guide further medical evaluation or treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for diagnosing infections caused by *E. coli*, such as urinary tract infections, bloodstream infections, or gastrointestinal issues. High counts may prompt antibiotics or other treatments to target the infection.

Short name

E. coli Count

Frequently asked questions

How long does it take to get results?
Results typically take 24 to 72 hours, depending on the lab’s processing speed. Some labs may provide preliminary findings sooner.
What if my test is positive for *E. coli*?
A positive result means you likely have an infection caused by *E. coli*. Your healthcare provider will discuss next steps, such as antibiotics, additional tests, or monitoring.
Can I take antibiotics before getting tested?
It’s best to avoid antibiotics unless prescribed, as they can affect test accuracy. Follow your doctor’s advice for timing.
  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