MedlinePlus Medical Encyclopedia: Stool ova and parasites exam

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Stool ova and parasites exam

Contents of this page:
Illustrations Alternative names Definition How the test is performed How to prepare for the test How the test will feel	Why the test is performed Normal Values What abnormal results mean What the risks are Special considerations

Illustrations

Lower digestive anatomy

Alternative names Return to top

Parasites and stool ova exam

Definition Return to top

Stool ova and parasites exam is a test for the presence of a parasite or worm-like infection of the intestine from stool analysis. Ova refers to the egg stage of a parasite's life cycle. Some parasites are single-cell organisms such as amoeba, giardia, and trichomonas, while others have a worm-like appearance.

How the test is performed Return to top

Adults and children:
There are many ways to collect the samples. You can catch the stool on plastic wrap that is loosely placed over the toilet bowl and held in place by the toilet seat. Then, put the sample in a clean container. One test kit supplies a special toilet tissue that you use to collect the sample, then put the sample in a clean container.

Infants and young children:
For children wearing diapers, line the diaper with plastic wrap. If the plastic wrap is positioned properly, isolating the stool from any urine output, mixing of urine and stool can be prevented for a better sample.

A small smear of stool is placed on a microscope slide and examined.

How to prepare for the test Return to top

You will be given a specimen container for the stool sample. Do not mix urine or toilet tissue in with the stool specimen.

How the test will feel Return to top

There is no discomfort.

Why the test is performed Return to top

The test is performed if a parasitic infestation is suspected, for prolonged diarrhea of unknown cause, or other intestinal symptoms.

Normal Values Return to top

The presence of normal bacteria and other microorganism in the stool is normal.

What abnormal results mean Return to top

Parasites or eggs are present in the stool indicating parasitic infestation.
See also:

What the risks are Return to top

There are no risks.

Special considerations Return to top

Not applicable.

Update Date: 1/26/2004

Updated by: Daniel Levy, M.D., Ph.D., Infectious Diseases, Greater Baltimore Medical Center, Baltimore, MD. Review provided by VeriMed Healthcare Network.

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