Ova and Parasites, Concentrate and Permanent Smear
Fasting Required: No

Specimen: Stool

Results: 7-10 Business days

Patient Preparation: Interfering substances: Bismuth, barium (wait 7-10 days), Antimicrobial agents (wait 2 weeks), Gallbladder dye (wait 3 weeks after procedure) ** A collection kit must be picked up at your closest Quest Diagnostics**

Reference Range(s): No ova and parasites seen

Description: 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.


Methodology: Microscopic Examination of Concentrate • Permanent Stained Smear

Includes: Ova and Parasite Concentrate Result, Trichrome Result

Alternative Name(s): O and P with Permanent Stain

Note: Result turnaround 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.