Understanding Lab Tests for Giardiasis
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Giardiasis is an intestinal infection caused by the microscopic parasite Giardia lamblia. This common parasitic infection affects the small intestine and can cause symptoms such as diarrhea, gas, stomach cramps, and abdominal discomfort. Accurate diagnosis requires specific laboratory testing to detect the presence of the parasite.
Recommended Test
Ova & Parasites w/Giardia Antigen (Stool)
This comprehensive stool test combines traditional microscopic examination for parasites with enzyme immunoassay (EIA) technology to detect Giardia antigens. The presence of Giardia antigens in the stool is a reliable indicator of an active infection. This dual approach increases the accuracy of detection, as it can identify both the parasite directly and the specific proteins it produces, ensuring proper diagnosis of giardiasis.
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Diagnosing Giardiasis
Because the symptoms of giardiasis can mimic other gastrointestinal conditions, laboratory testing is essential for a definitive diagnosis. The most effective approach involves analyzing stool samples to detect either the parasite itself or specific antigens produced by Giardia lamblia.
Understanding Your Test Results
A positive result for Giardia antigens or the presence of the parasite confirms an active giardiasis infection that typically requires antibiotic treatment. Early and accurate diagnosis is important for effective treatment and preventing the spread of infection to others.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
