Why does Dr$.$ Clark request stool samples for examination?

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He will have the laboratory prepare the samples for an ova and parasite $($O&P$)$ exam. Fresh or preserved stool samples can be observed microscopically for the presence of parasites or their eggs$/$cysts$.$

Dr$.$ Clark is hoping to find whole adult parasitic worms in Michael's fecal matter.

Tapeworms are pathogens of the gastrointestinal tract; as a natural progression of digestion some of the tapeworm pieces will be expelled along with fecal matter.

The stool sample will tell Dr$.$ Clark more information about the vegetables in Michael's diet.