Antibody to *Giardia lamblia* (IgG) - Serum

What This Test Measures

The test detects IgG antibodies produced by your immune system in response to *Giardia lamblia*. These antibodies appear after infection and can persist for months or years. The presence of these antibodies suggests prior exposure, though they don’t always confirm an active infection.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you’ve had symptoms like stomach cramps, diarrhea, bloating, or nausea—especially if you’ve traveled to areas with poor sanitation or consumed contaminated water. It’s also used in ongoing monitoring for people with recurrent symptoms or immune conditions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein, usually in a clinic or lab. The process takes a few minutes, and you may feel slight discomfort, but it’s generally quick and painless.

What the Results Mean

A positive result means your body has detected *Giardia lamblia* antibodies, indicating past exposure. A negative result suggests no detectable antibodies at this time, but it doesn’t rule out infection if symptoms persist. Follow-up testing or stool samples may be needed for confirmation.