Before the colonoscopy begins, it pays to ask your doctor some pointed questions. Sebastian Schroeder/ hide caption

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Sebastian Schroeder/

Cells gathered during a Pap test. Those on the left are normal, and those on the right are infected with human papillomavirus. Ed Uthman/Wikimedia Commons hide caption

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Ed Uthman/Wikimedia Commons

Doctors Revamp Guidelines For Pap Smears

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