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Escherichia coli (E. coli) bacterial culture and sensitivity (qualitative) with specific identification of antimicrobial resistance profiles

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

This test checks for the presence of *Escherichia coli* bacteria in your sample and determines how it may respond to certain antibiotics.

Quick summary

["Helps identify infections caused by E. coli and guides antibiotic treatment choices."]

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

Key facts at a glance

LOINC
20814-0
Short code
E coli F41 TSMI Ql IF
Synonyms
E coli F41 TSMI Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 This Test Measures

The test detects *E. coli* bacteria in your specimen and evaluates its susceptibility to a range of antibiotics. This helps determine the most effective treatment for any bacterial infection.

Why It Matters in Your Health

Identifying the specific *E. coli* strain and its antibiotic resistance patterns ensures targeted treatment, reducing unnecessary antibiotic use and preventing antibiotic resistance.

Sample Collection and Preparation

A sterile sample (likely urine, stool, or wound swab) is collected and sent to the lab. The lab grows the bacteria in a controlled environment to identify *E. coli* and test its response to antibiotics.

What to Expect After Testing

Results typically take 2–5 business days. You’ll receive a report indicating whether *E. coli* was found and which antibiotics it may resist, if applicable.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance includes diagnosing urinary tract infections, gastrointestinal infections, or other infections caused by *E. coli*, while guiding appropriate antibiotic therapy to prevent resistance.

Short name

E. coli screening and antibiotic resistance testing

Frequently asked questions

How long does it take to get results?
Results are usually available within 2 to 5 business days, depending on lab processing times.
Can I take antibiotics before my test?
Avoid antibiotics unless prescribed by your doctor, as they may affect test accuracy. Follow your healthcare provider’s instructions.
Does this test cover all antibiotic resistance types?
This test identifies common antibiotic resistance patterns but may not cover all possible resistance types. Your doctor may request additional tests if needed.
  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