Toxicity Screening for Giardia duodenalis (Antibody) – Serum

What This Test Measures

The test detects antibodies produced by your immune system in response to Giardia infection. These antibodies appear in your blood after the parasite has invaded your digestive tract, typically within weeks of exposure. This test is not used to directly identify the parasite itself but confirms past or ongoing immune response.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent diarrhea, stomach cramps, bloating, or nausea—especially after traveling to areas with poor sanitation or if you’ve been exposed to contaminated water. It’s also used for monitoring in people with recurring digestive issues.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is usually done in a lab and results are available within a few days.

What the Results Mean

Positive results suggest an immune response to Giardia, which may indicate past or current infection. Negative results mean no detectable antibodies were found, but this doesn’t rule out infection if symptoms persist. Follow-up testing or stool samples may be needed for confirmation.