Shiga toxin-producing Escherichia coli (E. coli) serotype O157:H7 toxin (qualitative, stool-based)
This test detects the presence of toxins produced by a harmful strain of E. coli found in stool samples. It helps identify possible infection that may cause severe illness, including kidney failure.
["This test checks for harmful toxins linked to a specific E. coli strain that can cause serious illness."]
Key facts at a glance
- LOINC
- 82299-9
- Short code
- E coli shiga-like toxin 1+2 Stl Ql IA
- Synonyms
- E coli shiga-like toxin 1+2 Stl Ql IA
- Category
- chemistry
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- CPT
- 82784
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms like severe stomach cramps, bloody diarrhea, or vomiting, especially after eating contaminated food. It’s also used in cases of suspected E. coli infection in children or those with kidney problems. This test helps confirm if the illness is caused by this particular strain of E. coli.
What to Expect Before the Test
No special preparation is needed. You’ll provide a stool sample, usually collected in a container provided by your healthcare team. Follow any instructions they give you to ensure the sample is collected correctly.
What Happens During the Test
The test involves analyzing a small sample of your stool using a sensitive detection method to identify specific toxins. Results are typically available within 24 hours.
What the Results Mean
A positive result means the toxins from E. coli O157:H7 were found in your stool, indicating possible infection. A negative result means the toxins were not detected, but other causes of symptoms should still be considered.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
E. coli O157:H7 is a rare but serious strain that can cause severe illness, including hemolytic uremic syndrome (HUS), which can lead to kidney failure. Early detection through this test helps guide treatment and prevents complications. Prompt medical attention is crucial if symptoms develop.
Short name
E. coli O157:H7 toxin test
Frequently asked questions
How long does it take to get results from this test?
What symptoms might I experience if this test is positive?
Can I eat or drink anything before giving the stool sample?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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