For more detailed images of the organs, a doctor may order a magnetic resonance imaging (MRI) scan or computerized axial tomography (CAT).
Imaging tests: An X-ray can help detect parasite-associated lesions in a person’s organs. Another test is a blood smear, where a drop of blood is examined for parasites under a microscope. A serology is a blood test that indicates antibodies or parasite antigens. Blood tests: A healthcare professional may perform a blood test to detect a specific parasitic infection. Colonoscopy: As an alternative to an endoscopy, a tube may be inserted through the rectum into the intestines to find parasites. Endoscopy: If stool samples do not contain a parasite, a thin tube called an endoscope may be inserted through the mouth into the intestines to reveal any parasites. 
Fecal exam: If a person is having diarrhea, gas, or other stomach symptoms, three or more stool samples may be collected on different days and examined for a parasite or parasite eggs. The following are some of the tests commonly used to diagnose a parasite infection: The tests a doctor may order to diagnose a parasite infection depend on factors such as the person’s symptoms, other medical conditions, and travel history. Ectoparasites: Ectoparasites are small organisms that live on the outside of the body. These include Ascaris lumbricoides and hookworm parasites. These parasites cannot multiply or divide within a human body and eventually pass through a person’s stool. Helminths: Helminths are parasitic worms that often root in a person’s digestive tract. Protozoa include Plasmodium malariae, which causes malaria infection, and Cryptosporidium, which is ingestible. These parasites can spread through contaminated food and water, person-to-person contact, and insect bites. Protozoa: Protozoa are single-celled organisms that can multiply in humans. There are three types of human parasites: Different parasites have different effects. Parasites are not a disease, but they can spread diseases. Many are invisible to the human eye, such as the malarial parasite, but some worm parasites can reach over 35 centimeters in length. 
Parasites vary widely in their characteristics.
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