The Giardia Lamblia (Feces) rapid cassette test is a rapid chromatographic immunoassay for the qualitative detection of Giardia Lamblia antigen in human stool samples. Parasitic infections remain a very serious health problem around the world. Giardia Lamblia is among the most common protozoa known to be a major cause of severe diarrhea in humans, particularly in immunocompromised people. Giardia Lamblia, also known as Giardia intestinalis, is a flagellated parasite that colonizes and reproduces in the small intestine, causing giardiasis. Parasitic infections remain a very serious health problem around the world. Giardia Lamblia is among the most common protozoa known to be a leading cause of severe diarrhea in humans, particularly in immunocompromised people. Giardia Lamblia, also known as Giardia intestinalis, is a flagellated parasite that colonizes and reproduces in the small intestine, causing giardiasis. The parasite attaches to the epithelium via a ventral adhesive disk and reproduces via binary fission. Epidemiological studies, in 1991, showed that Giardia infections increased in the United States with a prevalence of approximately 6% out of 178,000 samples. Generally, the disease goes through a short acute phase followed by a chronic phase. G. lamblia infection, in the acute phase, is the cause of watery diarrhea with elimination of trophozoites. The stool returns to normal, during the chronic phase, with transient emissions of cysts. The presence of the parasite on the wall of the duodenal epithelium is responsible for the malabsorption.