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Extended-Spectrum Beta-Lactamase (ESBL) Detection in Urine by Immunoassay

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

This test checks for bacteria in your urine that produce a specific enzyme called Extended-Spectrum Beta-Lactamase (ESBL). ESBL can make certain antibiotics less effective against the bacteria causing your infection.

Quick summary

["ESBL in urine helps determine if your infection may require different antibiotic treatment."]

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

Key facts at a glance

LOINC
85836-5
Short code
ESBL blaGES gene Islt/Spm Ql
Synonyms
ESBL blaGES gene Islt/Spm Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of a urinary tract infection (UTI) and have been prescribed antibiotics that ESBL-producing bacteria might resist. It helps guide treatment choices to ensure effective infection control.

How the Test Works

The test uses an immunoassay method to detect the presence of ESBL-producing bacteria in your urine. This involves identifying the enzyme that bacteria produce, which can alter how antibiotics work against them.

Sample Collection and Preparation

A urine sample is collected, typically via standard midstream clean-catch or catheter collection. The sample is then processed to detect the presence of ESBL-producing bacteria.

What the Results Mean

Positive results indicate the presence of ESBL-producing bacteria, which may require alternative antibiotics. Negative results suggest the bacteria are sensitive to the antibiotics you’ve been prescribed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: ESBL-Producing Bacteria and Treatment Implications

Short name

ESBL in Urine (Screen/Confirm)

Frequently asked questions

What does a positive ESBL test mean for my treatment?
A positive result means your infection may be caused by bacteria resistant to some commonly used antibiotics. Your healthcare provider will adjust your treatment plan to use antibiotics that are effective against ESBL-producing bacteria, such as carbapenems or other broad-spectrum agents.
Can I still take the antibiotics my doctor prescribed if the test is negative?
Yes, if the test is negative for ESBL, your current antibiotics are likely effective against the bacteria causing your infection. However, follow your doctor’s advice and complete the full course of treatment to ensure the infection is fully cleared.
How long does it take to get the results of this test?
Results are typically available within 24 to 48 hours, depending on lab processing times and confirmation steps. Your healthcare provider will contact you once the results are ready.
  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