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Ova and Parasite Exam

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Also known as: O&P
Formal name: Parasitic Examination, stool
Related tests: Gastrointestinal Pathogens Panel, Stool Culture, Giardia, Cryptosporidium, and Entamoeba histolytica Antigen Tests

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At a Glance

Why Get Tested?

To determine whether you have a parasite infecting your digestive tract

When to Get Tested?

When you have diarrhea that lasts more than a few days and/or have blood or mucus in your loose stools, especially if you have drunk unpurified water while camping or have traveled outside of the United States

Sample Required?

A fresh stool sample transported to the lab within 2 hours or a preserved stool sample; sometimes multiple samples collected on different days

Test Preparation Needed?