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Bacterial Susceptibility Test by Liquid Suspension Culture (LISLTB)

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

This test checks how well bacteria grow in a liquid medium and identifies which antibiotics might help treat an infection caused by those bacteria.

Quick summary

["Helps determine the best antibiotic treatment for bacterial infections by testing growth and sensitivity in lab conditions."]

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

Key facts at a glance

LOINC
50546-1
Short code
Bacterial Susc Pnl Islt KB
Synonyms
Bacterial Susc Pnl Islt KB
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
agar-diffusion
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 involves growing bacteria from a sample (often collected from a wound, urine, or other site) in a liquid medium. After incubation, the bacteria’s growth pattern and antibiotic resistance/sensitivity are analyzed to guide treatment decisions.

How the Test Works

A sample of your bodily fluid or tissue is mixed with a liquid medium containing specific antibiotics. If bacteria grow, it indicates resistance to that antibiotic. The results help identify which antibiotics are most effective against the identified bacteria.

Why It’s Done

Doctors order this test when they suspect a bacterial infection and need to confirm the type of bacteria and choose the right antibiotic to treat it effectively.

Preparation

No special preparation is needed. You may be asked to collect a sample (e.g., urine, blood, or wound swab) depending on the suspected infection site. Follow your healthcare provider’s instructions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Bacterial Culture Susceptibility

Frequently asked questions

Why might my doctor want this test?
Your doctor may order this test to confirm a bacterial infection, identify the specific bacteria causing it, and select the most appropriate antibiotic to prevent resistance and improve recovery.
How long will results take?
Results typically take 3–7 days, depending on the lab’s processing time and whether additional testing (like antimicrobial susceptibility) is needed. Follow-up may include a phone call or additional visit.
What if the test shows antibiotic resistance?
If the test shows resistance to common antibiotics, your doctor may recommend alternative treatments, such as stronger antibiotics or different classes of drugs, to ensure effective treatment.
  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