Escherichia coli Antigen in Stool by Immunoassay (Qualitative)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like diarrhea (especially with blood or mucus), abdominal pain, fever, or if you’ve recently traveled to areas with poor sanitation. It can also be used to confirm a suspected *E. coli* infection in children or those with recurrent urinary tract infections.

What to Expect Before the Test

No special preparation is needed. You’ll provide a fresh stool sample in a container provided by your lab. Avoid using toilet paper or cleaning agents that might alter the sample.

How the Test Works

The test uses an immunoassay (likely a rapid lateral flow or enzyme-based method) to detect specific proteins unique to *E. coli*. If the bacteria are present, the test will show a positive result.

Possible Results and Their Meanings

A **positive result** means *E. coli* bacteria were found in your stool. This could indicate an infection, though other bacteria or conditions may also cause similar symptoms. A **negative result** means no *E. coli* was detected, but other causes of symptoms (like viruses, parasites, or irritable bowel) could still be present.