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Pap smear

Definition

The Pap smear is a screening test for cervical cancer. Cells scraped from the opening of the cervix are examined under a microscope. The cervix is the lower part of the uterus (womb) that opens at the top of the vagina.

Alternative Names

Papanicolaou test

How the Test is Performed

You lie on a table and place your feet in stirrups. The doctor or nurse gently places an instrument called a speculum into the vagina to open it slightly. This allows the doctor or nurse to see inside the vagina and cervix.

Cells are gently scraped from the cervix area. The sample of cells is sent to a lab for examination.

How to Prepare for the Test

Tell your doctor or nurse about all the medicines you are taking. Some birth control pills that contain estrogen or progestin may affect test results.

Also tell your doctor or nurse if you:

Do not do the following for 24 hours before the test:

Avoid scheduling your Pap smear while you have your period (are menstruating). Blood may make the Pap smear results less accurate. If you are having unexpected bleeding, do not cancel your exam. Your doctor will determine if the Pap smear can still be done.

Empty your bladder just before the test.

How the Test will Feel

A Pap smear may cause some discomfort, similar to menstrual cramps. You may also feel some pressure during the exam.

You may bleed a little bit after the test.

Why the Test is Performed

The Pap smear is a screening test for cervical cancer. Most cervical cancers can be detected early if a woman has routine Pap smears.

Screening should start at age 21.

After the first test:

You may not need to have a Pap smear if you have had a total hysterectomy (uterus and cervix removed) and have not had an abnormal Pap smear, cervical cancer, or other pelvic cancer. Discuss this with your doctor.

Normal Results

A normal result means there are no abnormal cells present. The Pap smear test is not 100% accurate. Cervical cancer may be missed in a small number of cases. Most of the time, cervical cancer develops very slowly, and follow-up Pap smears should find any changes in time for treatment.

What Abnormal Results Mean

Abnormal results are grouped as follows:

ASCUS or AGUS

LSIL (low-grade dysplasia) or HSIL (high-grade dysplasia):

Carcinoma in situ (CIS):

Atypical squamous cells (ASC):

Atypical glandular cells (AGC):

When a Pap smear shows abnormal changes, further testing or follow-up is needed. The next step depends on the results of the Pap smear, your previous history of Pap smears, and risk factors you may have for cervical cancer.

For minor cell changes, doctors will recommend another Pap smear in 6 to 12 months.

Follow-up testing may include:

References

Noller KL. Intraepithelial neoplasia of the lower genital tract (cervix, vulva): etiology, screening, diagnostic techniques, management. In: Lentz GM, Lobo RA, Gershenson DM, Katz VL, eds. Comprehensive Gynecology. 6th ed. Philadelphia, Pa: Elsevier Mosby; 2012:chap 28.

American College of Obstetricians and Gynecologists. Practice Bulletin No. 131: Screening for cervical cancer. Obstet Gynecol. 2012;120:1222-1238.

American College of Obstetricians and Gynecologists. Practice Bulletin No. 99: Management of abnormal cervical cytology and histology. Obstet Gynecol. 2008;112:1419-1444.

American College of Obstetricians and Gynecologists. Committee Opinion No. 463: Cervical cancer in adolescents: screening, evaluation, and management. Obstet Gynecol. 2010;116:469-472.

Saslow D, Solomon D, Lawson HW, et al. American Cancer Society, American Society for Colposcopy and Cervical Pathology, and American Society for Clinical Pathology screening guidelines for the prevention and early detection of cervical cancer. CA Cancer J Clin. 2012;62(3):147-72.



Review Date: 3/11/2014
Reviewed By: Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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