Hematologist
CION Cancer Clinics
Safe surgery and travel when you have an MPN | CION Cancer Clinics
Most people with polycythaemia vera or essential thrombocythaemia can have surgery safely when it is planned. The two risks are clots and bleeding. The key precautions are getting blood counts under control first, and letting your haematologist and surgeon agree together on aspirin and other medicines. On long journeys, drink water, keep moving your legs and carry your reports. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Is surgery safe if you have polycythaemia vera or ET?
- What should happen before a planned operation?
- Do small procedures need the same care as big operations?
- What precautions help when you travel?
- Who needs to know what?
- What do people get wrong about surgery with an MPN?
- Common questions about surgery and travel with an MPN
The short answer
Is surgery safe if you have polycythaemia vera or ET?
Yes, most people with an MPN can have surgery safely, provided it is planned. The two risks to plan for are blood clots and bleeding, and both are higher than usual. The main precautions are getting your blood counts under control first and agreeing a plan for your medicines with both your haematologist and your surgeon.
Why an MPN changes the plan
An MPN (myeloproliferative neoplasm) means your marrow makes too many blood cells. Thick blood and high platelets make clots more likely, and surgery adds to that because you are lying still and the body is healing. At the same time, platelets in an MPN do not always work properly, so some people bleed more than expected. Aspirin adds a little to the bleeding side.
Why uncontrolled counts are the biggest problem
Most serious problems around surgery happen when counts are high at the time of the operation. In polycythaemia vera, that usually means the haematocrit (the share of your blood made up of red cells) has not been brought down to your target. For planned surgery, it is usually safer to wait a short time and get counts controlled than to go ahead straight away.
Who needs the most care
People who have had a clot or a bleed before, those having major surgery on the tummy, hip or knee, and those who will be in bed for a while need the closest planning.
This page cannot tell you whether your own surgery should go ahead now. That is decided by your haematologist and surgeon together.
!
After surgery or a long journey, do not wait on these
Go to the nearest emergency department now, or call 108, if you have a painful swollen calf, sudden breathlessness or chest pain, weakness or numbness on one side of the body, slurred speech, or bleeding from a wound that will not stop with firm pressure. Tell them you have polycythaemia vera or essential thrombocythaemia and which medicines you take.
Not sure whether this applies to you?
Ask an oncologistPlanned surgery
What should happen before a planned operation?
Tell both teams early
Let your haematologist know as soon as surgery is suggested, and tell the surgeon about your MPN at the first visit. They need to talk to each other.
Get counts under control
A recent blood count is checked. If counts are high, venesection or medicine may be used first, and the operation may be timed around that.
Agree a medicine plan
Your doctors decide whether aspirin, hydroxyurea or any blood thinner is paused, and for how long. Never stop these on your own before surgery.
Plan clot prevention after
Expect early walking, stockings and often blood thinning injections after the operation, with a clear date for restarting your usual medicines.
Different procedures
Do small procedures need the same care as big operations?
Not always. The level of planning depends on how big the procedure is and how much it bleeds.
Dental work
Cleaning and fillings usually need no change. Extractions may bleed more, so tell your dentist about your MPN and aspirin. Ask your haematologist before any medicine is paused.
Scopes and small procedures
An endoscopy, cataract surgery or a skin procedure is often done without major changes. If a biopsy is planned during a scope, the team may ask about aspirin in advance.
Major operations
Surgery on the tummy, heart, hips or knees needs full planning with your haematologist, including counts, medicines and clot prevention afterwards.
Bring to the surgeon
- Your latest blood counts
- A letter from your haematologist
- Your full medicine list
Emergency surgery
There is no time to plan, so make sure the team knows about your MPN at once. Carry a card or a phone note with your diagnosis, medicines and haematologist's contact.
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Journeys and holidays
What precautions help when you travel?
Most people with a stable MPN can travel. The main risk is a clot on a long journey, when you sit still for hours. This applies to long bus, train and car trips as much as to flights.
On a long journey
Drink water regularly and limit alcohol. Get up and walk when you can, or flex your ankles and calves while seated. Loose clothes help. Ask your haematologist whether compression stockings or any extra medicine suit you, especially if you have had a clot before.
Heat, altitude and pilgrimages
Hot weather and long queues can leave you dehydrated, which thickens the blood. Carry water and rest in the shade. High-altitude trips can raise red cell counts and breathlessness, so check with your team before planning one, especially if you have polycythaemia vera.
Medicines and papers
Carry enough medicine for the whole trip plus a few extra days, in your hand luggage. Keep a copy of your latest reports and your haematologist's letter. Check that your travel insurance covers existing conditions.
Who should delay a trip
Travel is not a good idea while your counts are still being brought under control, in the weeks after a clot or major surgery, or when a medicine has just been changed and you are waiting for a repeat test. In those situations a short delay is usually safer. Your haematologist can tell you when it is reasonable to go.
Side by side
Who needs to know what?
Person
What to tell them
Your surgeon
Your diagnosis, recent counts and any past clot or bleed
The anaesthetist
Every medicine, especially aspirin and blood thinners
Your haematologist
The date and type of surgery, as early as possible
Your dentist
That you have an MPN and take aspirin, before any extraction
A travel companion
The warning signs of a clot and where your reports are kept
Commonly believed
What do people get wrong about surgery with an MPN?
"I should stop my aspirin a week before, just to be safe."
Stopping aspirin raises your clot risk. For many procedures it is continued. Only your haematologist and surgeon, together, should decide whether to pause it and for how long.
"With a blood disorder, no surgeon will operate on me."
People with MPNs have all kinds of surgery, from cataracts to joint replacements. It needs planning, not refusal. A letter from your haematologist helps the surgeon feel confident.
"High platelets mean I will not bleed."
In an MPN, platelets may not work normally. Very high platelet counts can even cause bleeding. That is why counts and medicines are reviewed before surgery.
"Flying is the only kind of travel that causes clots."
Any long journey sitting still carries some risk, including buses, trains and cars. The same precautions of water, walking and moving your legs apply.
Questions we are asked
Common questions about surgery and travel with an MPN
Should hydroxyurea be stopped before surgery?
Often it is continued, because stopping it can let counts rise at the worst time. Sometimes it is paused briefly, for example around wound healing. This is a decision for your haematologist and surgeon. Do not stop or change it on your own.
How soon before surgery should counts be checked?
Your team will ask for a recent blood count close to the date of the operation, so they are working from current numbers. Reference ranges differ between laboratories, so it helps to have the test done where your haematologist can compare it with your earlier results.
Can I have a caesarean or gynaecological surgery?
Yes, with the same planning as any other operation. Clot risk is especially high around childbirth and after pelvic surgery, so blood thinning injections are commonly used afterwards. Make sure your gynaecologist and haematologist agree the plan well in advance.
Is a spinal or epidural anaesthetic safe for me?
It can be, but timing matters if you take aspirin or blood thinning injections. The anaesthetist needs to know every medicine and when you last took it. Tell them at the pre-operative check, not on the day of surgery.
Can I fly soon after surgery?
Both surgery and flying raise clot risk, and together they add up. Ask your surgeon and haematologist before booking. If you must travel, they may suggest extra precautions. Delaying a non-urgent trip until you are walking normally is often the safer choice.
What should I carry when travelling abroad?
Carry your medicines in their original packs in hand luggage, a medicine list with generic names, your latest blood report and a short letter from your haematologist. Note the local emergency number and the nearest large hospital where you are staying.
Do I need venesection before surgery?
If you have polycythaemia vera and your haematocrit is above your target, your haematologist may arrange venesection before a planned operation. It thins the blood and lowers clot risk. This is decided on your recent counts, not done routinely for everyone.
Is it safe to donate blood before my own surgery?
Blood removed by venesection in an MPN is taken as treatment, and is usually not used for transfusion. Saving your own blood for surgery is not standard in MPNs. Ask your haematologist how blood would be arranged if you needed it during the operation.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Polycythaemia
- NHS — Essential thrombocythaemia
- NHS — Deep vein thrombosis (DVT)
- NHLBI — Polycythemia Vera
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.
Keep reading
Related pages
Aspirin in MPN and Why It Is GivenWhy it is rarely stopped on your ownThrombosis Risk in MPN and How It Is ScoredYour clot risk before any operationHaematocrit Targets in Polycythaemia VeraThe count to control before surgeryVenesection: Why Blood Is Removed as TreatmentHow counts are brought down quickly
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Share your blood counts and surgery details with us. Our haematology team will review them and help coordinate a safe plan with your surgeon.