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O&P

Formal name: Ova and Parasite Exam
Related tests: Stool Culture, Giardia, Cryptosporidium, and Entamoeba histolytica antigen tests
At A Glance
 
Why get tested?
To determine whether you have a parasite infecting your gastrointestinal 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 or preserved stool sample, sometimes multiple samples collected on different days



This article was last reviewed on January 28, 2008.
 
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