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Ova and parasites test

Also called: O&P, Stool parasite test, Giardia test

This stool test looks for parasites, like Giardia, that can cause long-lasting diarrhea.

SampleA stool sample
Fasting?Usually not needed
ResultsSeveral days
Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.

What the test is

Several samples on different days may be needed.

Why it's done

  • Diarrhea lasting more than a week
  • After travel, camping, or drinking untreated water

Getting ready and what happens

  • Follow the kit instructions.

How the test is done

  • You collect stool samples in special containers.

What the results mean

Positive

Specific medicines treat each parasite.

Questions to ask your provider

  • What do my results mean for me?
  • Do I need to repeat this test or have other tests?

Related conditions

Related medicines

Related tests

Sources

Last updated 2026-11-13.