The Pap smear examines the cells from the cervix for changes that signify early pre-malignant (pre-cancerous) changes. It can also be used to screen for HPV infection, which we now now is associated with most of those changes.
http://www.nlm.nih.gov/medlineplus/ency/article/003911.htm
Edited by Family Physician on December 13 2007 at 1:54pm
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