Biomarker Reference · Giardia Ag
Giardia lamblia Antigen (Giardia Ag) is a clinical biomarker used in microbiome-gut assessment. Enzyme immunoassay detects Giardia-specific antigens in stool, offering higher sensitivity than microscopy for this flagellated protozoan that colonises the small intestine. It is measured in 1 laboratory test on BiomarkersLabs.com.
Enzyme immunoassay detects Giardia-specific antigens in stool, offering higher sensitivity than microscopy for this flagellated protozoan that colonises the small intestine. Giardia causes acute or chronic diarrhoea, bloating, and malabsorption through direct mucosal damage and altered brush-border function; cyst excretion is intermittent, so antigen testing captures more cases than a single microscopy specimen.
Giardiasis is a common cause of persistent diarrhoea in returning travellers, children in day-care settings, and immunocompromised patients. Antigen detection is more sensitive and practical than microscopy for routine screening, and a positive result directs antimicrobial therapy (metronidazole, tinidazole, or nitazoxanide).
Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.
1 test on BiomarkersLabs.com include this biomarker.
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