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Escherichia coli (E. coli) culture and antibiotic susceptibility testing (C&S) from a liquid culture

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

This test helps identify whether bacteria called *Escherichia coli* (a type of gut bacteria) are present in your sample and determines how your body might respond to antibiotics.

Quick summary

["It’s used to diagnose infections and guide treatment decisions."]

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

Key facts at a glance

LOINC
16836-9
Short code
E coli VT Stl Cult
Synonyms
E coli VT Stl Cult
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

What This Test Measures

The test involves growing bacteria from your sample in a liquid medium to detect *E. coli* and other microbes. If *E. coli* is found, it’s isolated for further testing to check antibiotic resistance patterns.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fever, abdominal pain, or signs of infection (e.g., urinary tract infection, gastrointestinal illness). It helps confirm the cause of infection and choose the best antibiotic.

Sample Collection and Preparation

A sterile sample (e.g., urine, blood, or stool) is sent to the lab. If liquid culture is used, bacteria are grown in a broth to detect growth and identify *E. coli* before antibiotic testing.

Antibiotic Resistance Testing

If *E. coli* is cultured, small amounts are exposed to different antibiotics. The test measures how well bacteria survive (resistance) or grow (sensitivity), helping determine the most effective treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

E. coli C&S (liquid culture)

Frequently asked questions

How long does this test take?
Results typically take 2–5 business days, depending on the lab’s workflow. Some labs may provide preliminary findings sooner.
What if my sample grows other bacteria?
Other bacteria may be present, but the focus is on *E. coli* if symptoms suggest it. Your provider will discuss findings with you based on clinical context.
Can I take antibiotics before the test?
Yes, but it may affect results. If you’ve already taken antibiotics, inform your provider—they may adjust testing or interpretation.
  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