What type of sample is tested in the Giardia antigen test?

The Giardia antigen test is specifically designed to detect the presence of Giardia lamblia, a protozoan parasite that causes gastrointestinal infections. The appropriate sample for this test is a stool sample because Giardia primarily infects the intestinal tract, leading to the shedding of its antigens in the feces of an infected individual.

Testing stool allows for direct identification of the Giardia antigens, providing an accurate diagnosis of giardiasis. Other sample types, such as blood, urine, or saliva, are not suitable for this particular test as they do not contain the specific antigens associated with the Giardia organism.