What is an ova and parasite test?An ova and parasite test looks for parasites and their eggs (ova) in a sample of your stool. A parasite is a tiny plant or animal that gets nutrients by living off another creature. Parasites can live in your digestive system and cause illness. These are known as intestinal parasites. Intestinal parasites affect tens of millions of people around the world. They are more common in countries where sanitation is poor, but millions of people in the United States get infected every year.The most common types of parasites in the U.S. include giardia and cryptosporidium, often referred to as crypto. These parasites are commonly found in:Rivers, lakes, and streams, even in those that appear cleanSwimming pools and hot tubsSurfaces such as bathroom handles and faucets, diaper changing tables, and toys. These surfaces may contain traces of stool from an infected person.FoodSoilMany people get infected with an intestinal parasite when they accidentally swallow contaminated water or take a drink from a lake or stream. Children at day care centers are also at higher risk for infection. Children may pick up the parasite by touching an infected surface and putting their fingers in their mouths.Fortunately, most parasite infections go away on their own or are easily treated. But a parasite infection can cause serious complications in people with weakened immune systems. Your immune system may be weakened by HIV/AIDS, cancer, or other disorders. Infants and older adults also have weaker immune systems.Other names: parasitic examination (stool), stool sample exam, stool O&P, fecal smear
