Understanding Lab Tests for Intestinal Parasitic Infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Intestinal parasitic infections are caused by various parasites that invade the digestive tract, including roundworms, hookworms, whipworms, and protozoa like Giardia. These infections can cause symptoms such as abdominal pain, diarrhea, nausea, and fatigue, but accurate diagnosis requires specialized laboratory testing.
Recommended Test
Ova & Parasites w/Giardia Antigen (Stool)
This comprehensive stool test is the gold standard for diagnosing intestinal parasitic infections. It detects the presence of parasite eggs (ova), adult parasites, and larvae in stool samples, while also specifically testing for Giardia antigens. This test can identify common parasites including roundworms, hookworms, whipworms, and Giardia, providing healthcare providers with the information needed to prescribe appropriate antiparasitic treatment.
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Diagnosing Intestinal Parasitic Infections
Since symptoms of parasitic infections can mimic other digestive disorders, laboratory testing is essential for definitive diagnosis. Stool analysis is the primary method for detecting parasites, their eggs (ova), and specific antigens that confirm the presence of these organisms in the intestinal tract.
Understanding Your Results
A positive result indicates the presence of parasites or their eggs in your digestive system, confirming an active infection that requires treatment. Your healthcare provider will prescribe specific antiparasitic medications based on the type of parasite identified. A negative result suggests no parasites were detected, though your doctor may recommend repeat testing if symptoms persist.
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 of suspected parasitic infections.
