This test is done when a person’s medical history suggests Giardiasis. Giardiasis is an illness that is caused because of an infection from Giardia Lamblia Parasite. This parasite is also known as Giardia intestinalis. One contracts this illness when he drinks water that is contaminated with this parasite. This parasite can be found in untreated rivers, streams, and lakes. The symptoms of Giardiasis include; diarrhea, gas, abdominal cramps, and nausea. This illness can be prevented by wash hands regularly, and by using filtered water. This test is carried out to check if the person has been completely cured of Giardiasis.