Cervical screening checks the cervix for high-risk HPV or precancerous cell changes before they ever become cancer. Current US guidance starts at age 21 (or 25 with primary HPV testing) and runs through 65: a Pap every three years in your twenties, then Pap, HPV testing, or both every three to five years after 30 USPSTF, 2018.
within 2 years
prevents, doesn't treat
| Item | Value |
|---|---|
| Clears on its own | 9 in 10 — within 2 years |
| Wart types | 6 & 11 |
| Cancer types | 16, 18 + |
| Vaccine | Gardasil 9 — prevents, doesn't treat |
How HPV and cervical screening actually works
HPV is the most common sexually transmitted infection CDC, and most of the time your immune system clears it on its own. In roughly nine out of ten cases the virus is gone within two years without causing any health problem. Screening exists for the minority of infections that linger, because persistent high-risk HPV slowly drives cervical cell changes toward cancer over years.
People blur together two separate problems. Low-risk types (6 and 11) cause genital warts and don't cause cancer. High-risk types (16, 18, and others) cause cancer and don't cause warts. Cervical screening is hunting for the high-risk types and the cell damage they leave behind.
How it's tested: the test and the sample
All three screening options use the same sample collection: a clinician inserts a speculum, then uses a small soft brush or spatula to gently scrape cells from the surface of the cervix. It takes seconds and feels like brief pressure or a mild cramp. The lab then runs one of three things on that sample.
- The Pap test (cytology) looks at the cervical cells under a microscope for abnormal shapes, the early footprint of HPV damage.
- The high-risk HPV test checks the same cells for the DNA of cancer-causing HPV types, flagging risk before cell changes are even visible.
- Co-testing runs both on one sample.
Primary HPV testing, the HPV DNA test used alone, is increasingly the preferred approach from age 25. It catches more true precancer with fewer visits, and since most HPV clears within two years anyway, chasing it yearly creates needless follow-up. See hpv testing for how each test reads and what triggers a repeat.
There's no routine HPV test for men, adolescents, or women under 30 CDC Pink Book. HPV in women is found through cervical screening rather than a general STD panel, and there's no approved equivalent screen for men. HPV testing is never used to diagnose genital warts; those are diagnosed by looking at them, and a swab result wouldn't change wart management.
When to test after exposure
There's no fixed "window" the way there is for some infections. The CDC doesn't define one, because HPV can sit silent for months or years, and warts can show up long after acquisition, so the time you caught it usually can't be pinned down. Screening is calendar-based: you test on a schedule for your age, not after a specific encounter. If you want the general framework for other infections, see when to test after exposure.
Who should get screened
Screening is built around the cervix, so it applies to people who have one. The schedule is age-banded, and the bands are where most confusion lives.
| Age | What to do | How often |
|---|---|---|
| Under 21 | No screening | — |
| 21–29 | Pap (cytology) | Every 3 years |
| 30–65 | Pap, OR high-risk HPV test alone, OR co-testing | Pap every 3 years; HPV alone or co-testing every 5 years |
| 25 onward (preferred, primary HPV) | Primary HPV test | Every 5 years |
| Over 65 | Stop, if prior screening was adequate and normal | — |
Why nothing before 21? HPV infections in the very young are extremely common and almost always clear on their own, so screening teens finds harmless transient infections and leads to overtreatment without preventing cancer. Why stop at 65? After a lifetime of normal results, the risk of new cancer-causing HPV becoming dangerous in time to matter is low. That depends on adequate prior screening: if you haven't been screened regularly, you don't simply age out. People who've had a total hysterectomy with cervix removal for non-cancer reasons generally don't need cervical screening either.
Vaccination doesn't change this calendar. Gardasil 9 prevents future infection but won't clear HPV or warts you already have, so even fully vaccinated people still need cervical screening. If you missed the shot earlier, the hpv vaccine for adults page covers catch-up eligibility.
A note on anal screening
There's no blanket recommendation for routine anal screening. CDC's 2021 guidance found the data insufficient to recommend routine anal cytology even for men who have sex with men or people with HIV. That position predates a 2022 trial showing that treating high-grade anal lesions reduced anal cancer in people with HIV, and some specialty groups now suggest periodic anal Pap for high-risk groups, but only where referral for high-resolution anoscopy exists. If you're in a high-risk group, ask a clinician who manages this rather than assuming it's a standard screen.
Getting tested: what the visit or kit is like
A cervical screen is a quick part of a pelvic exam, usually done at a primary care office, gynecology clinic, or a sexual-health center. Wear something easy to change out of, and try to schedule outside your period for a cleaner sample. The collection itself is brief; some spotting afterward is normal. Most insurance covers screening with no out-of-pocket cost because it's a Grade A preventive service, and clinics like Planned Parenthood offer sliding-scale pricing if you're uninsured.
At-home self-collection for primary HPV testing is expanding. You collect a vaginal swab yourself and mail it in, but it's still being rolled out and doesn't replace follow-up if a result comes back positive. To line up a clinic visit or a kit, you can get tested, and you can compare testing providers on price, turnaround, and what's actually included before you book.
Reading your results
Results come back as the test reads them, and the language differs by test type:
- Pap normal / negative for intraepithelial lesion: no abnormal cells. Return on your normal schedule.
- Pap ASC-US (atypical cells of undetermined significance): mildly abnormal cells, often nothing; usually triggers a reflex HPV test to decide whether you need a closer look.
- Pap LSIL / HSIL: low- or high-grade changes; HSIL means a higher chance of real precancer and a referral for colposcopy (a magnified look at the cervix, sometimes with a small biopsy).
- HPV negative: no high-risk types detected, the strongest reassurance the screen can give.
- HPV positive: a high-risk type is present. This is common and usually clears on its own; it means closer follow-up, not cancer. A positive for type 16 or 18 typically prompts colposcopy sooner because those two cause about 66% of cervical cancers NCI.
A positive HPV result is not a diagnosis and not a verdict on your partner's fidelity. The virus can stay silent for years, so it tells you nothing reliable about when or from whom you got it.
If your result is positive
A high-risk HPV result usually means watchful follow-up: a repeat test, or colposcopy if cells look high-grade. Genital warts are a separate, low-risk issue. A clinic can freeze them or prescribe a cream you apply at home over weeks, but treating warts doesn't remove the virus, so they can return. For what that means long-term, see do genital warts come back after treatment?.
When to see a clinician
Book a visit if you're due for screening by the schedule above, if you've had abnormal results that need follow-up, or if you notice bleeding between periods, bleeding after sex, unusual discharge, or new growths in the genital or anal area. These don't mean cancer, but they're worth a same-week look rather than waiting for your next routine screen.