Giardia duodenalis antigen (stool)

Why This Test Matters

Giardia is a common parasite that can infect the digestive system. It’s often spread through contaminated water or food. This test helps doctors identify if you have an infection caused by Giardia, which can lead to digestive issues like chronic diarrhea or stomach pain. Early detection is important to prevent dehydration and manage symptoms effectively.

What to Expect Before the Test

No special preparation is usually needed, but your doctor may ask you to collect a stool sample in a clean container. If you’re taking certain medications (like antibiotics), let your provider know, as they might affect the results.

How the Test Works

The test uses an immunoassay (a lab method that detects specific proteins from the parasite) to detect Giardia antigens in your stool. This is done quickly, often within hours, and doesn’t require special equipment at home.

Possible Results and Next Steps

A positive result means the test found Giardia antigens in your stool, suggesting an active infection. A negative result means the test did not detect the parasite. Your doctor may recommend retesting or additional tests (like blood tests) to confirm the diagnosis or rule out other causes of symptoms.