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Cold knife cone or LEEP: which one, and why | CION Cancer Clinics
Both remove a small cone of tissue from the cervix to take out abnormal cells and check them. LEEP uses a heated wire loop, usually under a local injection in a clinic. A cold knife cone uses a blade in theatre under anaesthetic, and is chosen when the pathologist needs clean edges or a deeper piece. Your report decides which fits. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- What is the difference between a cold knife cone and LEEP?
- How do the two compare on the day?
- Why might your doctor choose one over the other?
- What happens with each procedure, step by step?
- What do families often get wrong about these two operations?
- Which words will you see on your papers?
- What can this page not tell you?
- Common questions about cold knife cone and LEEP
The short answer
What is the difference between a cold knife cone and LEEP?
Both remove a small cone-shaped piece of the cervix, the neck of the womb, so that abnormal cells can be taken out and checked. LEEP uses a thin heated wire loop and is usually done under a local injection in a clinic. A cold knife cone uses a surgical blade and is done in an operation theatre while you are asleep or numb from the waist down.
Why two ways of doing the same job
The wire loop is quick and suits most women. But heat slightly scorches the edges of the tissue, and sometimes the pathologist needs those edges perfectly clean to read them. A blade leaves no heat mark, and it lets the surgeon shape a deeper or longer cone when the abnormal area climbs up inside the canal of the cervix.
You may see other names on your papers
LEEP is called LLETZ in British hospitals. Both names mean the same loop operation. A cold knife cone may be written as CKC or as conisation. None of these names tells you anything about how serious your result is.
The choice is made by your gynaecology or surgical team after looking at your colposcopy and biopsy. It is not something you pick from a menu.Side by side
How do the two compare on the day?
LEEP or LLETZ
Cold knife cone
Usually a local injection into the cervix, and you stay awake
Usually a general or spinal anaesthetic in theatre
Done in a clinic or day-care room in a short visit
Done as a day-care operation, occasionally with an overnight stay
Heated wire loop, which also seals small blood vessels
Surgical blade, with bleeding controlled by stitches or other methods
Edges may show slight heat change under the microscope
Edges are clean and easier to read
Usually removes a shallower piece
Can remove a deeper, longer cone when needed
Who gets which
Why might your doctor choose one over the other?
These are the things the team weighs. Your own report decides which of them apply to you.
Where LEEP usually fits
Abnormal cells that sit on the visible outer surface of the cervix, where the whole area can be seen clearly at colposcopy.
Often chosen for
- High-grade CIN seen fully on colposcopy
- Women who prefer to stay awake
Where a cold knife cone usually fits
Situations where the pathologist needs clean edges, or the surgeon needs to reach higher up the canal.
Often chosen for
- Abnormal gland cells, sometimes written as AIS
- A worry that early cancer may be present
- An abnormal area that cannot be fully seen
When LEEP may not suit
If the cervix is hard to reach, if you cannot lie still for a clinic procedure, or if an earlier treatment has changed the shape of the cervix, a theatre procedure may be safer.
When a cold knife cone may not suit
A deeper cone removes more of the cervix. For a woman hoping to become pregnant later, the team will try to take no more tissue than the result needs, and an anaesthetic carries its own checks.
Not sure whether this applies to you?
Ask an oncologistFrom booking to results
What happens with each procedure, step by step?
-
Before the day
You will be asked about bleeding problems, blood thinners and the chance of pregnancy. For a cold knife cone you will also have the checks needed before an anaesthetic. Do not change any medicine on your own; ask the team what to do.
-
The procedure
For LEEP you lie as you would for a smear, the cervix is numbed and the loop passes through in seconds. For a cold knife cone you are asleep or numb, and the operation itself is short.
-
Going home
Most women go home the same day after either procedure. After an anaesthetic, someone should take you home and stay with you that night.
-
The first weeks
Some bleeding and a brownish discharge are expected while the cervix heals. Your team will tell you how long to avoid sex, tampons and swimming.
-
The pathology report
The cone goes to the laboratory. The report says what the cells were and whether the edges were clear, and your doctor explains what it means for follow-up.
Commonly believed
What do families often get wrong about these two operations?
"The operation in theatre must be the stronger treatment."
Not in the way people mean it. Both remove the abnormal area. A cold knife cone is chosen for particular reasons, such as needing clean edges or a deeper piece, not because LEEP is a weaker version.
"Being told I need a cone means I have cancer."
Most cones are done for precancer, cells that have changed but are not cancer. Removing them is how cancer is prevented. The laboratory report is what tells you which it was.
"After this I will never be able to have children."
Many women have healthy pregnancies after either procedure. Removing tissue can raise the chance of an early birth, and deeper or repeated cones raise it more. Tell your team if you plan to become pregnant, so they can take that into account.
"If I feel fine afterwards, I can skip the follow-up test."
Feeling well tells you nothing about the cells. The follow-up smear and HPV test are how the team checks that the abnormal area has not come back. Keep that appointment even if you feel entirely normal.
On your report
Which words will you see on your papers?
- CIN
- Abnormal cells on the surface of the cervix. The grade, from one to three, says how far the cells have changed. It is not cancer.
- AIS
- Abnormal cells in the glands inside the canal of the cervix. They sit higher up and are often removed with a cold knife cone.
- Margin
- The edge of the tissue that was removed. A clear margin means no abnormal cells were seen at that edge.
- Thermal artefact
- Heat change at the edge of a LEEP specimen. It can make an edge harder for the pathologist to read.
- Transformation zone
- The ring of the cervix where most abnormal cells start. LLETZ means removing this zone with a loop.
Being straight with you
What can this page not tell you?
This page cannot tell you which procedure is right for you. That depends on what your colposcopy showed, what the biopsy found, your age, any earlier treatment and whether you plan to become pregnant. Your treating team sees all of that together.
Questions worth asking your doctor
Ask why this method was chosen for you, and what would have made the other one more suitable. Ask whether it will be done under a local or a general anaesthetic, how much tissue is likely to be removed, and when the report will be ready. If pregnancy matters to you, say so clearly before the day, not after.
If you are the son or daughter arranging this
Your mother may find these questions hard to ask in front of a family member. Offer to wait outside for part of the consultation. Make sure someone is free to take her home and sit with her that evening.
If a second opinion would settle your mind, bring the colposcopy report and the biopsy report with you.Questions we are asked
Common questions about cold knife cone and LEEP
Is LEEP the same as LLETZ?
Yes. LEEP is the name used in many American and Indian reports, and LLETZ is the name used in British hospitals. Both describe removing the abnormal area of the cervix with a thin heated wire loop. If your report uses one name and a leaflet uses the other, they are talking about the same thing.
Does LEEP hurt?
The local injection into the cervix can sting for a moment, and some women feel a period-like cramp during and after the procedure. Many feel pressure rather than pain. Tell the doctor if you are uncomfortable, because more numbing medicine can often be given. Simple pain relief your team suggests usually helps afterwards.
Why was I booked for theatre when my friend had it in clinic?
Because your results or your cervix may be different from hers. A theatre procedure is chosen when the team needs clean edges, a deeper piece of tissue, or a better view than a clinic allows. It is a choice about the right tool for your situation, not a sign that yours is worse.
Which one has more bleeding afterwards?
Both cause some bleeding and discharge while the cervix heals. A cold knife cone removes a larger piece and can bleed a little more. With either, heavy bleeding, large clots or bleeding with fever and a bad smell needs a same-day call to your team or a visit to the emergency department.
Will either affect a future pregnancy?
Either can slightly raise the chance of an early birth, and the risk rises with the depth of tissue removed and with repeat procedures. Many women go on to have healthy babies. If you become pregnant later, tell your obstetrician about the cone so the pregnancy can be watched more closely.
Can I choose which procedure I have?
You can and should ask questions, and your wishes about anaesthesia and pregnancy matter. But the method is largely decided by where the abnormal cells are and what the pathologist needs to see. Ask your doctor to explain why they recommend one, and what would change that advice.
How soon will the report come?
The tissue has to be processed and read under the microscope, which usually takes a week or two. Your team will tell you how you will receive it. If you have not heard by the time you were given, call and ask rather than assuming no news is good or bad news.
Does a cone mean I will need a hysterectomy later?
Usually not. For most women the cone removes the abnormal area and regular follow-up tests are all that is needed. A hysterectomy is considered only in particular situations, such as cells that keep returning or a cancer found in the specimen. Your team will explain the options if that ever arises.
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Sources
- NHS — Colposcopy
- National Cancer Institute — Understanding cervical changes
- American Cancer Society — Cervical cancer
- Cancer Research UK — Cervical cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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