Short answer
Pap and HPV tests answer complementary questions. Abnormal cells present now?
risky virus present?
Combined by age into schedules that maximize precancer detection while minimizing over-investigation of transient infections.
Neither test diagnoses cancer; both route to surveillance or colposcopy per combined results.
Understanding which test you had (and why that one at your age) turns confusing result letters into clear next steps.
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See Tests & Prices →How each test works, concretely
Pap (cytology): a clinician collects cervical cells during a speculum exam; a laboratory examines them under a microscope, grading from normal through ASC-US and LSIL (mild, usually watched) to HSIL (precancer-suspicious, worked up).
It finds cell changes regardless of cause.
HPV test: molecular detection of high-risk HPV DNA in cervical (or vaginal, including self-collected) samples. Usually pooled high-risk result, sometimes with HPV 16/18 genotyping that fast-tracks follow-up.
Same sampling visit, different laboratories, different questions answered.
Age-stratified use and why it differs
21–29: Pap every 3 years. HPV testing is intentionally omitted. Prevalence is extremely high and overwhelmingly transient at these ages, so testing would trigger cascades of colposcopies for infections destined to clear.
(One exception: HPV testing reflexively for ASC-US triage.) 30–65: three valid strategies: HPV-primary testing every 5 years (increasingly preferred), co-testing (HPV plus Pap) every 5, or Pap alone every 3.
65+: exit with adequate prior negatives and no high-risk history.
Immune suppression intensifies every schedule.
Interpreting combinations without panic
- Both negative: longest safe intervals. The best possible result.
- HPV-positive, Pap-normal: surveillance (repeat on schedule), except HPV 16/18 which often fast-tracks to colposcopy given their outsized cancer share.
- Abnormal Pap regardless of HPV: colposcopy thresholds by grade.
- Persistent HPV positivity across rounds: escalates evaluation even with normal Paps.
Most abnormal results are mild changes under surveillance, not cancer. But every result deserves its scheduled follow-up, since delays defeat screening’s purpose.
See What an Abnormal Pap Result Means.
When to seek care
On schedule for whichever strategy your practice uses (ask which one. Many patients don’t know), promptly for follow-up testing or colposcopy after abnormal results, and for abnormal bleeding outside screening contexts regardless of last screen date.