Ova and Parasites Examination
Fasting Required: No

Specimen: Stool

Results: 1-2 Business days

The ova and parasite (O&P) exam is used to help diagnose the cause of persistent diarrhea. It determines whether there are parasites present in the lower digestive tract and, if so, to identify them. Since there are many other causes of diarrhea, the O&P is often ordered along with other tests, such as a stool culture, which identifies the presence of disease-causing bacteria in the stool.

Ova and Parasite Concentrate Result, Trichrome Result

Microscopic Examination of Concentrate • Permanent Stained Smear

Reference Range(s)
No ova and parasites seen

Clinical Significance
Diseases caused by human parasites remain on a worldwide basis among the principle causes of morbidity and mortality. Correct diagnosis of intestinal parasitic infection depends on proper collection, transport, detection and identification of parasites in stool specimens. Symptoms range from malaise to death. Treatment is dependent upon examining multiple stool specimens due to the erratic shed rates of some parasites.

Alternative Name(s)
O and P with Permanent Stain

Patient Preparation
Interfering substances: Bismuth, barium (wait 7-10 days), Antimicrobial agents (wait 2 weeks), Gallbladder dye (wait 3 weeks after procedure)

Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.