IVC filter insertion (Inferior vena cava (IVC) filter insertion and removal)
A small metal device placed inside the large vein that returns blood from the legs to the heart, to catch blood clots and stop them reaching the lungs, mainly when blood-thinning medicine cannot be used.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- An IVC filter is a small device placed in the main vein from the legs to catch clots and stop them reaching the lungs.
- It is mainly for people who cannot have blood-thinning medicine, or whose clots continue despite it — it does not replace anticoagulation or dissolve clots.
- It is put in through a small vein puncture under X-ray guidance with local anaesthetic, not open surgery.
- Most filters are retrievable and should be removed once no longer needed; NICE advises a documented removal plan, as filters left in long-term can cause complications.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your radiologist will give you advice for your situation.
Reduces the chance of a clot reaching the lungs when blood thinners cannot be used
Blood-thinning medicine can be given safely, which is the standard treatment for most clots.
You lie still for a period and are watched, especially at the puncture site, to make sure there is no bleeding. Mild soreness is normal.
A documented removal strategy and timeframe agreed before the filter is fitted, in line with NICE.
You lie still for a period and are watched, especially at the puncture site, to make sure there is no bleeding...
The puncture site settles. Most people can return to normal gentle activity quickly, depending on their overall...
Your team reviews whether blood-thinning medicine can be safely restarted. The puncture site heals fully.
Once blood thinners are safely back on board and the temporary reason has passed, removal of a retrievable filter...
What is an IVC filter?
An inferior vena cava (IVC) filter is a small, cage-like metal device placed inside the inferior vena cava — the large vein that carries blood from the legs and lower body back to the heart. It is designed to let blood flow normally while catching blood clots that break off from the legs or pelvis, so they cannot travel to the lungs and cause a pulmonary embolism (a clot on the lung), which can be life-threatening.
The usual treatment for blood clots is anticoagulation (blood-thinning medicine). An IVC filter is not a substitute for this. It is used mainly when blood-thinning medicine cannot be given — for example because of serious bleeding or an operation — or when clots keep happening despite proper anticoagulation. It does not treat or dissolve clots; it only catches them.
An interventional radiologist places the filter through a small puncture in a vein in the neck or groin, using X-ray guidance and local anaesthetic. Most filters today are 'retrievable', meaning they are designed to be taken out again. A very important point — strongly emphasised by NICE — is that there should be a clear, documented plan to remove the filter as soon as it is no longer needed, because filters that are left in long-term can cause problems. Removing the filter is itself a similar minor procedure.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
IVC filter versus blood-thinning medicine
| Feature | IVC filter | Anticoagulation |
|---|---|---|
| What it does | Catches clots heading to the lungs | Treats and helps prevent clots |
| Main use | When blood thinners can't be used or have failed | Standard treatment for most clots |
| Dissolves clots | No | Helps the body break clots down |
| Reversible | Retrievable types can be removed | Can be stopped when no longer needed |
A filter is usually an addition for a specific situation, not a replacement for blood-thinning medicine. Anticoagulation should usually restart, and the filter be removed, as soon as it is safe.
Preparing for your procedure
- Make sure you understand why a filter is being recommended for you and what the plan is to remove it.
- Tell the team about allergies, including to contrast dye, and any kidney problems.
- Discuss your blood-thinning medicines and the reason they cannot currently be used.
- Mention any bleeding problems, recent or planned surgery, or pregnancy.
- You may have blood tests beforehand to check clotting and kidney function.
- If sedation is planned, follow any fasting instructions and arrange someone to take you home.
- Ask for the filter's details to keep, and note that you must tell future scan teams you have one.
What happens
You lie on an X-ray couch and are connected to monitors. The skin over a vein in your neck or groin is cleaned and numbed with local anaesthetic; light sedation may be used. A needle is used to enter the vein through a small puncture — there is no cut — and a thin tube (catheter) is passed into the inferior vena cava.
Using X-ray pictures and an injection of contrast dye, the interventional radiologist checks the size and position of the vein and the level of any clot, then chooses where to place the filter. The filter is delivered through the catheter in a collapsed form and opens up inside the vein, anchoring gently to the vein wall.
The catheter is removed and pressure is applied to the puncture site to stop any bleeding; a small dressing is applied. The procedure usually takes around 30 to 60 minutes. You rest and are watched for a period afterwards. The filter starts working straight away. If it is a retrievable filter, the team records a plan and timeframe to remove it, which is done as a similar procedure later.
Is this procedure right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Blood-thinning medicine can be given safely, which is the standard treatment for most clots.
- There is no clot in the legs or pelvis and no clear reason a filter would help.
- The vein anatomy or a large clot makes safe placement difficult, so another approach is needed.
- There is no realistic plan or means to remove a retrievable filter when no longer needed.
Delay or rearrange if…
- Anticoagulation could still be started or resumed safely instead.
- There is an active infection at the puncture site or in the bloodstream.
- Kidney function or contrast allergy needs checking before using contrast dye.
- There is a chance you are pregnant and the procedure uses X-ray (unless urgently needed).
Alternatives to discuss
- Anticoagulation (blood-thinning medicine) as the standard treatment where it can be used.
- Adjusting or changing anticoagulation if clots have continued.
- Treating the cause of any bleeding so that blood thinners can be restarted.
- Close monitoring in selected situations, guided by your team.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Comfort, sedation or contrast choices
If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.
Benefits
- Reduces the chance of a clot reaching the lungs when blood thinners cannot be used
- Provides protection during a period when anticoagulation is unsafe, such as around surgery or bleeding
- Lets blood continue to flow normally through the vein
- Retrievable filters can be removed once the risk has passed
- Placed through a small vein puncture rather than open surgery
Risks & complications
- Bruising or soreness at the neck or groin puncture site
- A small amount of bleeding at the puncture site
- The need to remember the filter is in place for future scans and care
- Anxiety about a device being left in the body until it is removed
- The filter tilting or not opening fully, which can affect how well it works
- A clot forming on or just below the filter
- Difficulty removing the filter if it has been in place a long time
- Damage to the vein at the puncture or filter site
- The filter moving (migrating) from where it was placed
- A strut of the filter poking through the vein wall into nearby structures
- Fracture of part of the filter, with a fragment moving elsewhere
- Serious bleeding or injury during placement or removal
The most important issues are specific to filters left in place too long: clot forming on the filter, tilting, struts poking through the vein wall, fracture, and increasing difficulty with removal over time. This is exactly why NICE advises that a clear plan to remove a retrievable filter — and to restart blood thinners when safe — should be documented before it is even put in. If you have a filter, make sure you know who is responsible for arranging its removal and tell every future scan or hospital team that you have one.
Published figures to discuss
The chance of filter-related problems rises the longer a filter stays in place, which is why early removal is emphasised. Reported complication rates vary widely between studies, filter types and how long filters remain. The figure below is from a published systematic review and is given for general guidance, not as a precise personal risk.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Any filter-related complication | At least around 11 in 100 in a published systematic review | Includes clot on the filter, tilting, struts poking through the vein, fracture and migration; risk rises the longer the filter stays in. | Inferior vena cava filters and complications: a systematic review (PMC)ncbi.nlm.nih.govSource-linked context |
| Filter not retrieved when no longer needed | Common real-world problem | SIR guidance recommends structured follow-up and retrieval when PE risk has passed and removal risk is acceptable. | Inferior vena cava filters and complications: a systematic review (PMC)ncbi.nlm.nih.govSource-linked context |
| New DVT or filter thrombosis | Recognised risk | A filter does not treat the existing clot; anticoagulation is restarted when safe. | Inferior vena cava filters and complications: a systematic review (PMC)ncbi.nlm.nih.govSource-linked context |
| Insertion complications such as tilt, misplacement or access-site bleeding | Uncommon | Experienced image-guided placement keeps these risks low, but follow-up imaging may be needed. | Inferior vena cava filters and complications: a systematic review (PMC)ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
Recovery from placing the filter is usually quick, with mild soreness at the puncture site. The most important part of 'aftercare' is the plan to remove a retrievable filter once it is no longer needed, and to restart anticoagulation when it is safe.
- Mild soreness or bruising at the neck or groin puncture site for a few days
- Quick return to gentle activity if your overall condition allows
- No physical sensation from the filter itself once it is in place
- A planned timeframe to review removal rather than leaving it indefinitely
Aftercare
- Keep the puncture site clean and dry, and watch for bleeding or swelling.
- Make sure you and your GP know there is a documented plan and timeframe to remove the filter.
- Restart and continue blood-thinning medicine exactly as advised once it is judged safe.
- Tell any future scan team (especially MRI), or any hospital, that you have an IVC filter.
- Keep the filter's details or card with you.
- Attend appointments arranged for review and for filter removal.
- Know who to contact about the filter and its removal, and the urgent warning signs below.
- The filter's details or information card
- A documented plan and timeframe for removal
- Knowing who is responsible for arranging removal
- A clear plan for restarting blood-thinning medicine
- A note for future MRI or hospital teams that you have a filter
- A contact number and the urgent warning signs
Scars and how they heal
There is no surgical scar. The filter is placed and later removed through a small needle puncture in a vein in the neck or groin, which leaves only a tiny mark that may bruise and usually fades within days.
⚠ Get urgent help if…
- Sudden breathlessness, chest pain or coughing up blood — call 999 (possible clot on the lung)
- Severe back, tummy or flank pain after the procedure
- New swelling, pain or colour change in a leg (possible clot)
- Heavy bleeding, or a large or growing swelling, at the puncture site
- Fever, increasing redness, heat or discharge at the puncture site (possible infection)
- Signs of an allergic reaction to the contrast dye such as rash, swelling or breathing difficulty — call 999
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your radiologist gives you.
Results & realistic expectations
A well-placed filter does its job immediately — catching clots travelling from the legs so they cannot reach the lungs — during a period when blood-thinning medicine cannot be used. It does not treat or dissolve clots, and it is not a long-term replacement for anticoagulation. The best result is a filter that protects you for as long as needed and is then removed once it is safe, with blood thinners restarted, avoiding the complications that come from leaving a filter in place indefinitely.
Retrievable filters are designed to be temporary and should be removed at the earliest safe opportunity. The longer a filter stays in, the higher the chance of problems such as clot on the filter, tilting, struts poking through the vein wall, fracture, and difficulty removing it. Permanent filters are used only when there is a long-term reason not to take blood thinners. NICE is clear that a removal strategy should be planned and documented before the filter is even fitted.
Related tests, treatments or support
An IVC filter is usually one part of managing blood clots (deep vein thrombosis or pulmonary embolism) in a difficult situation, such as around major surgery, serious bleeding, or clots continuing despite treatment. It is normally combined with the aim of restarting anticoagulation as soon as it is safe. The filter and the blood-thinning plan should be managed together by your team.
Follow-up & long-term care
You should have clear follow-up arranged both to review restarting blood thinners and to arrange removal of a retrievable filter at the earliest safe opportunity. Make sure it is clear who is responsible for this, as filters can otherwise be forgotten and left in too long. Seek urgent help for breathlessness, chest pain, leg swelling or severe abdominal or back pain rather than waiting for the next appointment.
- A documented plan and timeframe to remove a retrievable filter
- Regular review of whether anticoagulation can be safely restarted
- Clear responsibility for arranging filter removal
- Informing future scan and hospital teams that a filter is in place
Repeat, follow-on and what comes next
- A retrievable filter requires a second procedure to remove it.
- A tilted or embedded filter can be harder to remove and may need a more complex retrieval.
- If a filter cannot be removed, it may have to stay permanently, with ongoing risks.
- Anticoagulation should usually be restarted as soon as it is safe, alongside removal planning.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A documented removal strategy and timeframe agreed before the filter is fitted, in line with NICE.
- A named person or team responsible for arranging removal and restarting anticoagulation.
- Clear information for you and your GP, and a filter card for future scans and hospital visits.
- Written urgent warning signs (breathlessness, chest pain, leg swelling, severe abdominal or back pain) and who to contact.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether a retrievable or permanent filter is used, and the device itself
- The interventional radiologist's fee and use of an imaging room with X-ray
- Whether light sedation is used
- Contrast dye and pre-procedure blood tests
- The separate later procedure to remove a retrievable filter
- Management of any complications
- The operator and facility fees for inserting the filter
- The device and imaging used to guide placement
- Any sedation and its monitoring
- The cost and plan for removing a retrievable filter
- How follow-up and the removal procedure are arranged
- What happens, and who pays, if a complication occurs
On the NHS? IVC filters are placed on the NHS for selected people, mainly when blood-thinning medicine cannot be used or has failed; private placement is uncommon and is mainly for speed or choice within wider clot care.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Not making clear the filter does not replace blood-thinning medicine or dissolve clots.
- No documented plan or named person responsible for removing a retrievable filter.
- Not explaining the risks of leaving a filter in long-term.
- Not advising you to tell future MRI and hospital teams about the filter.
- No plan for restarting anticoagulation when it becomes safe.
Marketing red flags
- Presenting a filter as a simple or without risks alternative to blood thinners.
- Placing a filter without a clear, documented removal plan.
- Not discussing the complications of long-term filters.
- Suggesting a filter treats or cures clots rather than just catching them.
Choosing a specialist safely
- Check the radiologist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the radiologist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good radiologist will welcome every one of these.
- Why is a filter the right choice for me right now, and is it retrievable?
- What is the plan and timeframe to remove it, and who is responsible for arranging that?
- When and how will my blood-thinning medicine be restarted?
- What are the risks if the filter has to stay in longer than planned?
- What should I tell future scan or hospital teams about the filter?
- What are the urgent warning signs afterwards, and who do I contact?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the radiologist who carries out my procedure, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this procedure not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Why do I need a filter instead of just blood thinners?
Does the filter dissolve my clots?
Will the filter be taken out again?
What happens if a filter is left in too long?
Can I have an MRI with a filter in?
Is having the filter put in painful?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE NG158 — Venous thromboembolic diseases: recommendations (IVC filters) BSIR — Inferior vena cava filter insertion and removal NHS — Pulmonary embolism NHS — DVT (deep vein thrombosis) Inferior vena cava filters and complications: a systematic review (PMC)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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