NILM on a Pap result: what it means and what happens next
NILM is the most common cytology result and the most underrated one: it contains the word "negative", and that is exactly what worries people. In fact it is the best thing that can be written on the report. Here is what the abbreviation stands for, why a normal result does not replace HPV testing, when the next test is due, and what the notes often printed beside it mean.
What NILM means
NILM stands for negative for intraepithelial lesion or malignancy: no intraepithelial lesion and no malignant cells were found. It is the wording of the Bethesda system, used for cytology reports worldwide, Poland included.
The word negative here means "not found", not "bad". In laboratory medicine it always works that way: a negative result is the good one. Put plainly, the laboratory looked at cells from the cervix and saw neither precancerous changes nor cancer.
A normal cytology does not replace an HPV test
This is the one thing worth taking away. Cytology looks at consequences — cells already changed by the virus. An HPV test looks for the cause, the virus itself. The virus can be present while the cells have not changed yet: cytology will then read NILM, and it will be correct.
That is why the Polish programme is built around HPV testing: high-risk HPV first, and liquid-based cytology only if it is positive, from the same sample. More about the test itself is in the article on HPV testing.
In practice: NILM with positive HPV does not mean "all clear, forget it", it means "the cells are fine for now, we keep watching" — the follow-up depends on the virus type. NILM with negative HPV is the most reassuring combination there is.
Notes beside NILM that alarm people for nothing
What usually causes worry is not the result itself but the lines next to it:
| On the report | What it is | What to do |
|---|---|---|
| Zmiany zapalne — inflammatory changes | signs of inflammation in the smear | with symptoms, deal with those; without symptoms it needs no treatment |
| Zmiany zanikowe / atroficzne — atrophic changes | low estrogen, a common finding after menopause | discuss at the appointment; local estrogen is sometimes prescribed |
| Flora bakteryjna — a description of the flora | what happened to be in view | not a diagnosis in itself; with symptoms a flora swab is taken |
| Brak komórek strefy przekształceń — no transformation zone cells | the sample missed the most informative zone | not an error; the test is sometimes repeated earlier |
| Materiał nie nadaje się do oceny — sample not suitable | this is not NILM, and not a result at all | the smear is repeated in 6–12 weeks |
None of these lines means precancer. They describe the background against which the cells were read.
When the next test is due
In Poland the cervical cancer prevention programme covers women aged 25–64 and is free for the insured, with no referral. The interval depends on which test is used:
- HPV test — every five years while it is negative;
- conventional cytology, where it is still done on its own — every three years;
- more often — with reduced immunity, after treatment for cervical changes, and if a previous result was abnormal.
Three and five years are not a cost-saving measure. Cervical changes develop over 10–15 years, so those intervals catch them with room to spare. Annual cytology does not find more — it finds more doubtful results. What is worth doing every year and what is not is in a separate article.
When NILM is not a reason to relax
Screening is designed for healthy women without symptoms. If there are symptoms, a normal cytology neither cancels them nor says anything about them:
- bleeding after sex or between periods;
- any bleeding after menopause;
- pain low in the abdomen, or pain during sex;
- discharge with an odor, or itching — that is about flora, not cytology.
These need an examination, and sometimes colposcopy, regardless of what the last report says.
If the report does not say NILM
Then it will carry one of the abbreviations: ASC-US, LSIL, HSIL, ASC-H or AGC. None of them is a diagnosis — they are levels of attention. What each one means is in the overview of cytology results, and the commonest and most confusing one is covered separately in the article on ASC-US.
I take cytology samples at an ordinary appointment in Warsaw at ul. Głębocka 9, held in Polish, Russian and Ukrainian. No referral or NFZ insurance is needed and a PESEL number is not required. If you are bringing an older report, bring all of them: comparing results says more than the latest one alone.
Short answers
What does NILM mean on a Pap test?
NILM stands for negative for intraepithelial lesion or malignancy — no intraepithelial lesion and no malignant cells were found. It is a normal result: there are no altered or cancerous cells in the smear. "Negative" here means "not found", not "bad".
Is NILM a good result?
Yes, it is the best possible cytology result and also the most common. It calls for no treatment and no early repeat smear. The only thing to do is to come back for the next scheduled test when it is due.
Can you have HPV with a NILM result?
Yes. Cytology sees cells that have already changed, while an HPV test detects the virus itself, which can be present before any change appears. That is why the Polish programme is built around HPV testing, with cytology run when it is positive.
When should cytology be repeated after NILM?
If you were screened with an HPV test and it was negative, in five years. If conventional cytology was done on its own, in three years. Sooner with reduced immunity, after treatment for cervical changes, and if a previous result was abnormal.
What does "zmiany zapalne" next to NILM mean?
It means inflammatory changes in the smear: a description of the background, not a diagnosis and not precancer. If there are symptoms — discharge, itching, odor — they are dealt with separately, usually with a flora swab. Without symptoms the note needs no treatment.
Sources
The primary sources this text rests on. Links open in a new tab.
- HPV and Pap Test Results: Next Steps after an Abnormal Cervical Cancer Screening TestNational Cancer Institute, USA — what a normal result means and when testing is repeated
- Profilaktyka raka szyjki macicypacjent.gov.pl — the Polish programme: who is eligible, how often, HPV testing every five years
- Co powinnaś wiedzieć o cytologiipacjent.gov.pl — how to prepare for sampling and what to do with the result
- Rekomendacje Polskiego Towarzystwa Ginekologów i PołożnikówPTGiP — the standard of care in Poland; my colposcopy certificate is issued under the same rules
This text describes the general picture and does not replace a consultation. Timings and indications differ from woman to woman and are decided at the appointment, from your history and test results.
