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Microbiological culture and sensitivity (specimen: stool)

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

This test helps identify bacteria or other microbes in your stool and determines which antibiotics could effectively treat any infection found.

Quick summary

["A stool culture helps diagnose infections like diarrhea-causing bacteria and guides antibiotic choices."]

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

Key facts at a glance

LOINC
52794-5
Short code
O+P sp3 Spec Micro
Synonyms
O+P sp3 Spec Micro
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
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 doctor may order a stool culture if you have symptoms like persistent diarrhea, bloody stools, fever, or if you’ve been exposed to a known foodborne illness. It’s also used to check for infections in people with weakened immune systems or those with chronic digestive conditions.

What to Expect During the Test

You’ll provide a sample of your stool in a sterile container. The sample is then sent to a lab where microbes are grown on special media to identify any bacteria. Sensitivity testing follows to see which antibiotics would work best against any detected organisms.

Common Microbes Tested

This test can detect a wide range of bacteria, including *Escherichia coli* (E. coli), *Salmonella*, *Shigella*, *Campylobacter*, *Clostridium difficile*, and others. Viruses and parasites may also be investigated depending on clinical suspicion.

Preparation and Care

No special preparation is needed, but avoid using antibiotics before testing if possible. Collect the sample fresh (ideally within 24 hours) and keep it refrigerated if not processed immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Stool Culture & Antibiotic Sensitivity

Frequently asked questions

How long does a stool culture take to return results?
Results typically take 3–7 days, though some urgent cases may be processed faster. Sensitivity results can take up to 10 days or longer depending on the lab’s workload.
Can I eat or drink normally before the test?
Yes, you can eat and drink as usual. Avoid using antibiotics before testing if your doctor recommends it, as they may affect the results.
What if my stool culture comes back positive for bacteria?
If bacteria are found, your doctor will prescribe the most appropriate antibiotic based on the sensitivity results. Follow their instructions carefully to avoid antibiotic resistance and ensure full recovery.
  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