Escherichia coli (E. coli) quantitative culture from stool sample

Why This Test Matters

E. coli is a normal part of gut bacteria, but certain strains can cause infections like diarrhea, urinary tract infections, or bloodstream infections. This test helps doctors diagnose infections and guide treatment, especially if you have symptoms like persistent diarrhea, fever, or dehydration.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a fresh stool sample in a sterile container. Avoid using toilet paper or cleaning products that could alter the sample. If you’re taking antibiotics, let your healthcare provider know, as this may affect results.

How the Test Works

A small sample of your stool is mixed with a growth medium in a lab. Over time, any E. coli bacteria will multiply and grow. The test then counts how many colonies (visible bacterial growth) appear, indicating the bacterial load.

Possible Results and Next Steps

A high count of E. coli may signal an infection, while normal levels suggest no active infection. If results are abnormal, your doctor may recommend further testing (like bloodwork or imaging) or prescribe antibiotics if needed. Follow-up may include retesting if symptoms persist.