Giardia intestinalis
Giardia intestinalis is a flagellated protozoan parasite that infects the small intestine and is a frequent cause of parasitic gastrointestinal illness worldwide. It is commonly transmitted through contaminated water, food, or close person-to-person contact, including childcare settings and travel-related exposure.
On the GI – Advanced Profile (US BioTek), Giardia intestinalis is measured to assess whether parasitic infection may be contributing to acute or chronic digestive symptoms. Once established, Giardia can interfere with fat and carbohydrate absorption, damage the intestinal lining, and disrupt normal digestive enzyme activity.
Infected individuals may experience symptoms such as diarrhea, loose or greasy stools, bloating, excessive gas, abdominal cramping, nausea, fatigue, and unintended weight loss. In some cases, symptoms may persist even after initial infection, contributing to post-infectious irritable bowel syndrome (IBS) or ongoing malabsorption.
Because Giardia can persist without immediate symptoms, detection is clinically important even in mildly symptomatic individuals. Interpretation should consider stool consistency, inflammatory markers, nutrient deficiencies, and other pathogens detected on the panel. Early identification supports timely treatment and helps prevent prolonged gut dysfunction.
A low or undetectable level of Giardia intestinalis indicates no evidence of active giardiasis at the time of testing. This result is considered favorable and suggests that Giardia is unlikely to be contributing to current gastrointestinal symptoms.
If digestive issues are present despite a negative result, other bacterial, parasitic, inflammatory, or functional causes should be evaluated.
What does it mean if your Giardia intestinalis result is too high?
An elevated or detected level of Giardia intestinalis indicates active parasitic infection. High levels are commonly associated with diarrhea, bloating, malabsorption, abdominal discomfort, and fatigue.
Giardia detection typically warrants clinical treatment, even when symptoms are mild, as untreated infection can lead to prolonged intestinal irritation and nutrient deficiencies. Management often includes antiparasitic therapy, hydration support, gut lining repair, and follow-up testing to confirm eradication.
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