Escherichia coli Antigen in Stool (Qualitative)

Why This Test Might Be Ordered

Your healthcare provider may recommend 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 higher risk of food/waterborne illnesses. It’s also used to diagnose conditions like traveler’s diarrhea, urinary tract infections (if symptoms persist), or to rule out infections in newborns or immunocompromised individuals.

How the Test Works

The test detects specific proteins (antigens) from *E. coli* bacteria in your stool sample. If the bacteria are present, the test will show a positive result. This is done using a simple, rapid immunoassay method that provides results in minutes.

Sample Collection and Preparation

You’ll need to collect a fresh stool sample (usually a small amount from a single bowel movement) in a provided container. Avoid using toilet paper or cleaning products. Bring the sample to your lab appointment on the same day, as the test is best performed fresh.

What to Expect During the Test

No special preparation is needed, but you may be asked to avoid certain medications (like antibiotics) for a short time before testing if directed by your provider. The test itself is quick and painless—just a small sample is sent to the lab for analysis.