LLETZ stands for large loop excision of the transformation zone. It’s a short procedure that uses a thin, electrically heated wire loop to remove a small area of tissue from the cervix where abnormal cells have been found. The goal is to cut away these cells before they have a chance to develop into cervical cancer. You might also hear it called LEEP (loop electrosurgical excision procedure) or loop diathermy, which are different names for the same thing. LEEP is the common term in the United States, while LLETZ is used more widely in the UK and Australia.
Why LLETZ Is Recommended
LLETZ is typically recommended after a cervical screening test (smear test) has found abnormal cells and a follow-up examination called colposcopy has confirmed the problem. The abnormal cells are graded by severity: CIN1 is mild, CIN2 is moderate, and CIN3 is severe. LLETZ is the standard treatment for high-grade changes, meaning CIN2 or CIN3, which carry a meaningful risk of progressing to cervical cancer if left untreated.
You won’t usually be offered LLETZ for mild changes alone. Low-grade abnormalities often clear up on their own, so doctors will typically monitor them first. Persistent low-grade changes that don’t resolve, or results that are difficult to interpret, can also lead to a referral.
What Happens During the Procedure
The procedure is usually done as an outpatient appointment, meaning you go home the same day. In the UK, US, and Australia, it’s most commonly performed under local anesthetic. A speculum is inserted (the same device used during a smear test), and a local anesthetic is injected into the cervix in several places. This numbs the area within about a minute. You’ll be awake throughout.
Once the cervix is numb, the doctor uses a small wire loop that carries a low-voltage electrical current. The loop cuts through the tissue and seals the wound at the same time, which helps control bleeding. The piece of tissue removed includes the “transformation zone,” the specific area of the cervix where abnormal cells and cervical cancer most commonly develop. The entire process takes only a few minutes once the anesthetic has taken effect.
Most people describe the sensation as mild cramping, similar to period pain. Some feel nothing beyond pressure. In some European countries, the procedure is done under general anesthetic, but research shows no difference in outcomes, and patients treated under local anesthetic actually report higher satisfaction afterward.
Recovery and What to Expect Afterward
You can go home shortly after the procedure and most people return to normal daily activities within a day or two. Some vaginal bleeding and a brownish discharge are normal for several weeks. This is part of the healing process as the treated area forms a scab and eventually sheds it.
For the first six weeks after treatment, you should avoid:
- Sexual intercourse
- Tampons (use pads instead)
- Baths, swimming pools, and hot tubs
- Strenuous exercise
These restrictions exist to give the cervix time to heal and reduce the risk of infection or heavy bleeding. Showers are fine throughout recovery.
How Effective LLETZ Is
LLETZ has been the standard treatment for cervical pre-cancer since 1989, and for most people, a single procedure is all that’s needed. The removed tissue is sent to a lab, where pathologists check whether the abnormal cells extend to the edges of the sample (called the margins). About 75% of procedures achieve clear margins, meaning the abnormal tissue appears to have been fully removed. When margins are unclear or positive, it doesn’t always mean abnormal cells remain, but it does prompt closer follow-up.
Around six months after treatment, you’ll be invited for a follow-up screening test. This checks both for any remaining abnormal cells and for HPV, the virus responsible for nearly all cervical cancers. If both results come back normal, the treatment has been successful and you return to routine screening. A small number of people will need a repeat procedure.
Possible Complications
LLETZ is a safe procedure, but like any surgery, it carries some risks. The most common complications are:
- Bleeding: Some bleeding in the weeks after treatment is normal, but occasionally it becomes heavy enough to need medical attention.
- Infection: Signs include discharge with an unpleasant smell, fever, or increasing pain. This is uncommon and treatable with antibiotics.
- Cervical stenosis: The cervix can narrow as it heals, which happens in roughly 2% to 5% of cases. In rare instances, this can affect periods by trapping menstrual blood, or complicate future fertility procedures.
Most people experience nothing worse than cramping and discharge that resolves on its own.
Impact on Future Pregnancies
This is one of the most common concerns, and the picture is reassuring for most people. LLETZ is specifically classified as a fertility-sparing treatment, meaning it does not affect your ability to get pregnant.
The main consideration is preterm birth. Earlier research suggested that people who’d had LLETZ were roughly twice as likely to deliver prematurely. However, more recent studies that accounted for other risk factors found a much smaller association, and in some analyses, no independent link at all. The risk depends heavily on how much tissue was removed. Excisions of less than 10 mm in depth appear to have minimal, if any, effect on preterm birth risk. When more than 20 mm of tissue is removed, the risk rises to about one in six pregnancies delivering early.
This relationship holds across multiple pregnancies. Even if your first birth after LLETZ goes to full term, a larger excision (over 15 mm) still carries some increased risk in later pregnancies. For this reason, surgeons aim to remove only as much tissue as necessary. If you’re planning a future pregnancy, your doctor can factor this into treatment decisions and monitor your cervical length during pregnancy if needed.