Toxicity of Giardia lamblia (parasite) in serum/plasma

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you’ve recently traveled to areas with high Giardia prevalence, have symptoms like diarrhea, bloating, or stomach pain, or if you’re in close contact with someone who has a Giardia infection. It can also be part of routine monitoring for individuals at higher risk, such as those with weakened immune systems or frequent travelers.

What to Expect Before the Test

No special preparation is usually needed. You’ll provide a blood sample from a vein in your arm. If you’re concerned about discomfort, let your provider know so they can discuss options. Avoid alcohol for 24 hours before testing if instructed.

What the Test Results Mean

Results may show markers of exposure (e.g., antibodies) to Giardia, suggesting past or current infection. If positive, further testing (like stool samples) may be needed to confirm the parasite’s presence. Results alone don’t diagnose Giardia—your provider will interpret them in context with your symptoms and medical history.

Common Causes of Positive Results

Positive results often occur after exposure to Giardia cysts in contaminated water or food. Symptoms like watery diarrhea, gas, or stomach cramps may appear weeks later. Chronic exposure can lead to ongoing digestive issues.