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Cervical cytology report

ASCUS on a Pap Smear: — What Your Result Means

ASCUS is the most common abnormal Pap result in the world, and it is also the most misunderstood. Most people who receive this result do not need treatment — but they do need the right follow-up test.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Not a cancer diagnosis — ASCUS means slightly unusual cells, not cancer and not a confirmed precancer.
  • The most common abnormal result — Most abnormal Pap reports carry an ASCUS finding — it is routine for this to be investigated.
  • HPV testing decides the next step — Whether you need colposcopy or a repeat smear depends on your HPV co-test result.
  • Most resolve without treatment — When the cause is a passing HPV infection, the cells often return to normal on their own.
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ASCUS stands for Atypical Squamous Cells of Undetermined Significance. It means the cervical cells looked slightly unusual — not clearly normal, and not clearly precancerous. It is the most common abnormal Pap result. Most cases are linked to a transient HPV infection. The standard next step, per ASCCP 2019 guidance, is HPV co-testing on the same sample.

How does ASCUS compare to other Pap result categories?

Bethesda categoryWhat the cells look likeRisk levelTypical next step
NILM — NormalNo abnormal cells seenRoutineContinue routine screening
ASCUSSlightly atypical — cause unclearLowHPV co-test or repeat Pap in 12 months
ASC-HAtypical, cannot exclude high-grade changeModerateColposcopy
LSILLow-grade changes, typically HPV-relatedLow to moderateCo-test, repeat Pap or colposcopy
HSILHigh-grade cell changesHigherColposcopy

What to do after an ASCUS result

  • Check whether an HPV co-test was done on the same sample — ask your doctor or the laboratory
  • Note whether your report says ASCUS or ASC-H — they have different implications and different follow-up paths
  • Book the follow-up your doctor recommends — HPV testing, colposcopy or a repeat Pap — and do not delay it
  • Tell your doctor about any current infection, pregnancy, recent delivery or recent cervical procedure
  • Keep a copy of your report for future appointments

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What the terms on your report mean

ASCUS
Atypical Squamous Cells of Undetermined Significance — the Bethesda category for cervical cells that look slightly unusual with no clear cause identified
ASC-H
Atypical Squamous Cells, Cannot Exclude High-Grade SIL — a higher-risk subcategory requiring colposcopy regardless of HPV result
Bethesda System
The internationally adopted reporting framework for cervical cytology, used in India and worldwide
HPV co-test / reflex HPV
An HPV test done on the same cervical sample as the Pap, used to decide whether colposcopy or a repeat smear is the right next step
NILM
Negative for Intraepithelial Lesion or Malignancy — the normal result, meaning no abnormal cells were found
Colposcopy
A close-up examination of the cervix using a magnifying instrument, performed when further investigation is needed after an abnormal Pap

Questions this result usually raises

Does ASCUS mean I have cancer or might develop it?

No. ASCUS sits at the lowest-risk end of the Bethesda scale. Most cases are caused by a passing HPV infection or mild inflammation, and most clear up without treatment. The follow-up test exists to find the small minority where an early abnormality is present — not because cancer is the likely explanation.

What is the difference between ASCUS and ASC-H?

ASC-H means the pathologist cannot rule out a high-grade lesion, which carries a meaningfully higher risk than ASCUS. Management differs too: ASC-H goes straight to colposcopy; ASCUS management depends on the HPV co-test result. If your report says ASC-H, your doctor will act faster than they would for ASCUS.

Will I need a colposcopy for ASCUS?

Not automatically. For ASCUS, the decision depends on your HPV co-test. A negative HPV result means low risk — a repeat test in 12 months is the usual path. A positive HPV result typically means colposcopy. ASCCP 2019 guidance frames this around HPV risk, not the ASCUS finding alone.

Can ASCUS resolve without treatment?

Often, yes. When the cause is a passing HPV infection — the most common scenario — the cells can return to normal once the immune system clears the virus, usually within one to two years. The 12-month follow-up is designed to confirm that resolution has happened, not to treat something still present.

Is ASCUS linked to something I did or did not do?

ASCUS is most often caused by HPV, which most sexually active adults encounter at some point. It is not a reflection of hygiene or behaviour. Persistent high-risk HPV infection, rather than a single exposure, is what matters for cervical risk — and that is what follow-up testing looks for.

Did you know?

ASCUS is the most frequently reported abnormal finding in cervical cytology worldwide, accounting for more abnormal Pap results than all other Bethesda categories combined.

The follow-up strategy is built around the fact that most cases resolve on their own — its purpose is to identify the minority who need earlier attention, not to treat everyone.

Source: Bethesda System for Reporting Cervical Cytology, 4th edition (2014)

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Common questions

Frequently asked questions

What does it mean if my Pap smear report says ASCUS?

ASCUS stands for Atypical Squamous Cells of Undetermined Significance. It means the cervical cells looked slightly unusual — not clearly normal, not clearly precancerous. It is the most common abnormal Pap result. Most cases are caused by a passing HPV infection that the immune system clears on its own. ASCUS is not a cancer diagnosis.

What test do I need after an ASCUS result?

The standard next step is HPV co-testing — a test for high-risk HPV types, done on the same sample or at a follow-up visit. A negative HPV result means low risk; a repeat test in 12 months is the usual path. A positive HPV result typically leads to colposcopy. ASCCP 2019 guidelines frame the decision around HPV risk, not the ASCUS category alone.

Is an ASCUS result serious?

ASCUS is classified as low risk within the Bethesda System, and most cases resolve without treatment. It is not a diagnosis of cancer or precancer. The follow-up test identifies the small group who need earlier attention. Complete the recommended follow-up — there is no need for alarm before that result is back.

My report says ASC-H, not ASCUS. Is that different?

Yes, meaningfully so. ASC-H means the pathologist cannot rule out a high-grade lesion, which carries a higher risk than standard ASCUS. Colposcopy is recommended for ASC-H regardless of the HPV result — you do not wait for co-testing first. If your report says ASC-H, book your colposcopy promptly rather than waiting for a repeat smear.

Can an infection or being pregnant cause an ASCUS result?

Yes. Vaginal infections, inflammation, hormonal changes during pregnancy, and changes after menopause can all produce cell appearances that fall into the ASCUS category — partly why the category uses the word 'undetermined'. Tell your doctor about any current infection, pregnancy, or medications you are taking. This context helps them interpret your result accurately.

Will I need more frequent Pap smears after an ASCUS result?

That depends on your HPV co-test result. ASCUS with a negative HPV result usually means a repeat test in 12 months; if that is normal, routine screening intervals resume. ASCUS with a positive HPV result typically leads to colposcopy instead of a repeat smear. Ask your doctor which path applies to you and keep the follow-up appointment.

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