Key Takeaways
- Cervical cancer is largely preventable through routine screening and HPV vaccination.
- Pap tests detect abnormal cervical cells; HPV tests detect the virus that causes most cervical cancers.
- Most guidelines recommend screening starting at age 21, regardless of sexual history.
- An abnormal result does not mean you have cancer — follow-up steps are typically straightforward.
- Many people over 65 with an adequate screening history can safely stop routine cervical screening.
Start here
Why Cervical Cancer Screening Matters
Next
How Pap Tests and HPV Tests Work
Then
Recommended Screening Schedules by Age
When you're ready
Understanding Your Results
Advanced
Special Circumstances and Exceptions
Why Cervical Cancer Screening Matters
Cervical cancer is one of the most preventable cancers in the United States, largely because reliable, widely available screening tools can detect precancerous changes in cervical cells before they ever become cancer. According to the American Cancer Society, the death rate from cervical cancer has dropped dramatically over the past several decades — a decline attributed in large part to routine screening programs.
The cervix is the lower, narrow end of the uterus that connects to the vagina. Almost all cervical cancers are caused by persistent infection with certain high-risk strains of the HPV (human papillomavirus), a common sexually transmitted infection. Because precancerous changes develop slowly — often over years — regular screening gives healthcare providers a meaningful window to act before problems progress.
HPV Vaccination Adds Another Layer of Protection
The HPV vaccine is recommended for preteens but can be given through age 26, and in some cases up to age 45 after a conversation with a provider. Vaccination significantly reduces the risk of infection from the most common cancer-causing HPV strains. However, it does not replace the need for routine cervical screening, since the vaccine does not cover all high-risk strains.
How Pap Tests and HPV Tests Work
Two primary tests are used for cervical cancer screening, and they detect different things:
- Pap test (Pap smear)
- A provider collects a small sample of cells from the surface of the cervix during a pelvic exam. Those cells are examined under a microscope for abnormal changes. A Pap test does not detect HPV directly — it looks at the cells themselves.
- HPV test
- This test checks the same cell sample for the presence of high-risk HPV strains most associated with cervical cancer. It can be done on its own (primary HPV testing) or alongside a Pap test (co-testing).
Both tests are performed in a similar way during a routine gynecologic exam. The collection procedure is brief and uses a small brush or spatula to gently collect cells from the cervix.
HPV (Human Papillomavirus)
A very common virus spread through skin-to-skin sexual contact. Most infections clear on their own, but persistent high-risk strains can lead to cervical cell changes over time.
Pap test (Pap smear)
A screening test that collects cells from the cervix and examines them under a microscope to look for abnormal changes that could become cancer.
Co-testing
Performing a Pap test and an HPV test at the same time using the same cell sample, giving a more complete picture of cervical health.
Colposcopy
A clinical procedure in which a provider uses a magnifying instrument to examine the cervix closely, often ordered when a Pap or HPV result is abnormal.
Precancerous cells
Abnormal cells that have the potential to become cancerous if left untreated, but are not yet cancer. Early detection through screening allows treatment before cancer develops.
Primary HPV testing
Using an HPV test alone — without a simultaneous Pap test — as the first-line cervical cancer screening method, now approved for adults aged 25 and older.
Recommended Screening Schedules by Age
U.S. guidelines from organizations such as the U.S. Preventive Services Task Force (USPSTF) and the American Cancer Society generally align on the following framework:
- Under 21: Routine screening is not recommended, regardless of sexual activity onset.
- Ages 21–29: A Pap test alone every three years. HPV testing is generally not recommended in this age group because transient HPV infections are very common and usually clear without causing harm.
- Ages 30–65: Three options are considered acceptable — a Pap test alone every three years, co-testing (Pap plus HPV) every five years, or primary HPV testing every five years. Discuss which approach fits your medical history with your provider.
- Over 65: People with an adequate history of normal screening results may be able to stop routine cervical screening. Your provider can help determine if this applies to you.
Understanding Your Results
Receiving an abnormal result can feel alarming, but it is important to understand what the result actually means before drawing conclusions.
Pap Test Results
Results are reported using standardized terminology. Common findings include:
- Normal (Negative): No abnormal cells detected.
- ASC-US (Atypical Squamous Cells of Undetermined Significance): Slightly abnormal cells that often resolve on their own. Usually prompts an HPV test or a repeat Pap in one year.
- LSIL (Low-Grade Squamous Intraepithelial Lesion): Mild cell changes, often related to HPV. May be monitored or referred for colposcopy.
- HSIL (High-Grade Squamous Intraepithelial Lesion): More significant changes that warrant closer evaluation, typically via colposcopy.
HPV Test Results
A positive HPV test means one or more high-risk HPV strains were detected. It does not mean you have cancer. Many infections clear on their own. Your provider will recommend next steps based on which strain was found and your Pap test result.
A colposcopy — a magnified examination of the cervix — is the most common follow-up procedure and is performed in a clinic setting. It allows a provider to take a closer look and, if needed, collect a small tissue sample (biopsy) for further analysis.
Special Circumstances and Exceptions
Standard screening schedules are designed for people at average risk. Your provider may recommend a modified approach if any of the following apply:
- History of high-grade cervical abnormalities or cervical cancer: More frequent or extended surveillance is typically recommended even after treatment.
- Immunocompromising conditions (such as HIV): Guidelines generally call for more frequent screening in people living with HIV or other conditions that affect immune function.
- DES exposure in utero: People whose mothers took diethylstilbestrol (DES) during pregnancy face a higher risk of certain cervical and vaginal abnormalities and may need additional monitoring.
- Hysterectomy: A total hysterectomy that removed the cervix for a non-cancerous reason typically means routine Pap tests can be stopped. Partial hysterectomies leave the cervix in place, so screening continues.
- Pregnancy: Cervical screening can be safely performed during pregnancy. Discuss timing and any results with your obstetric provider.
This article is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your personal screening schedule and any results you receive.