Antibody to *Giardia lamblia* (IgG) – Serum

What Does This Test Measure?

The test detects IgG antibodies, which your body makes after exposure to *Giardia lamblia*. These antibodies appear weeks to months after infection and can linger for years. This test is typically used to confirm past or ongoing infection rather than diagnose it immediately, as symptoms may not appear until later.

Why Might You Need This Test?

A healthcare provider may order this test if you have symptoms like stomach cramps, diarrhea, bloating, or nausea—especially if you’ve traveled to areas with poor water quality or have had recent contact with someone infected. It’s also used in screening for travelers or those exposed to contaminated water.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting. Avoid alcohol for 24 hours before the test if instructed, but this is not always required for antibody tests.

What to Expect After the Test

You may experience mild discomfort or bruising at the injection site, but this usually fades within a few days. Results are typically ready within a few days to a week, depending on your lab. Follow up with your provider if you have questions or concerns about your results.