* According to the CDC, detection of antigens on the surface of organisms in stool specimens is the current test of choice for diagnosis of<unk>  and provides increased sensitivity over more common microscopy techniques. * A trichrome stain of preserved stool is another method used to detect Giardia. * Microscopic examination of the stool can be performed for diagnosis. This method is not preferred, however, due to inconsistent shedding of trophozoites and cysts in infected hosts. Multiple samples over a period of time, typically one week, must be examined. * The Entero-Test uses a gelatin capsule with an attached thread. One end is attached to the inner aspect of the host's cheek, and the capsule is swallowed. Later, the thread is withdrawn and shaken in saline to release trophozoites which can be detected with a microscope. The sensitivity of this test is low, however, and is not routinely used for diagnosis. * Immunologic enzyme-linked immunosorbent assay (ELISA) testing may be used for diagnosis. These tests are capable of a 90% detection rate or more. Although hydrogen breath tests indicate poorer rates of carbohydrate absorption in those asymptomatically infected, such tests are not diagnostic of infection. Serological tests are not helpful in diagnosis.
Giardiasis
Irritable bowel syndrome
Cryptosporidiosis
Cyclosporiasis
Eosinophilic gastroenteritis
Dientamoebiasis
Opisthorchiasis
Amoebiasis