Hi Cibélle. Here you go.

http://en.wikipedia.org/wiki/Pap_smear
       The Papanicolaou test (also called Pap smear, Pap test, cervical smear, or smear test)  is a screening test used in gynecology to detect premalignant and malignant (cancerous)  processes in the ectocervix. Significant changes  can be treated, thus preventing cervical  cancer.  It is estimated that that test have reduced cervical cancers in 70% since its creation by Dr. George Papanicolaou in 1940. Thus, paps have been made for more 69 years, since then.

      They are used to cervical cancer screening (in Portuguese is more known "exame de citologia cervical" aka exame de papanicolau.

http://en.wikipedia.org/wiki/Papanicolaou_stain
Papanicolaou Stain (the technique) or pap smear (the procedure). So, Depends on wich one you are talking about.

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  Hope it helps you with your translation job.

  PP.