Toxicity Screening for Giardia lamblia (Qualitative, Serum/Plasma)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve experienced persistent digestive issues—such as chronic diarrhea, bloating, or stomach pain—that don’t improve with usual treatments. It could also be used if you’ve traveled to areas with higher parasite risks or if you’re part of a group at increased risk (e.g., daycare workers, travelers).

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re using blood thinners, let your provider know before the test.

What the Test Results Mean

A positive result means your body has detected Giardia antibodies, suggesting past or current infection. A negative result means no detectable antibodies were found, but it doesn’t rule out infection if symptoms persist. Follow-up testing (like stool exams) may be needed for confirmation.

Common Symptoms of Giardia Infection

Symptoms may include watery diarrhea, stomach cramps, bloating, gas, nausea, or weight loss. Some people may have mild or no symptoms at all. These signs can last weeks or months and may worsen if untreated.