Anti-Giardia Lamblia Antibody, Immunoassay (Serum/Plasma)

What Does This Test Measure?

The test looks for antibodies produced by your immune system in response to *Giardia lamblia*, a single-celled parasite that can cause gastrointestinal symptoms. Antibodies indicate exposure to the parasite, which may have been present in your system at some point, even if symptoms have resolved. This is a **serum or plasma-based immunoassay**, meaning it detects specific proteins (antibodies) rather than the parasite itself.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you have symptoms like diarrhea, stomach cramps, bloating, or nausea—especially if you’ve traveled to areas with poor sanitation or consumed potentially contaminated food/water. It’s also used in screening for travelers, those with chronic digestive issues, or individuals exposed to the parasite.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it’s tested for antibodies using an immunoassay method. Results are typically ready within 1–3 business days.

What Are Possible Results?

A positive result suggests you’ve been exposed to *Giardia lamblia* at some point, but it doesn’t always mean you’re currently infected. A negative result means no detectable antibodies were found, which may indicate no prior exposure or an active infection not yet detectable by antibodies alone.